Vendors:
1)

"All BrickArms products are sized to perfectly fit your figs and designed and produced to meet the highest standards of quality. Each BrickArms toy will mesh seamlessly with your other building toys, and thousands of builders worldwide have used BrickArms to explore new ways of building and play. "
I find that I utilize BrickArms the most of all the various Independent Lego Accessory Vendors, and find them to have the right amount of detail for use with the LEGO minifigure. I also have never had any problems with the weapons not working with minifigure anatomy! My favorite items include the newly released ARC Rifle, the newly released Minigun, the MGL, and the M1919.
Website: http://www.BrickArms.com*
*You can no longer order BrickArms directly from their website - you have to order through resellers:
US Reseller -

GIBricks: http://www.GIBricks.com
-They have great customer service, and offer the full range of production BrickArms items.
-They OFTEN have sales on BrickArms items, as well as MANY giveaways.
-Visit their Flickr site or the BrickArms forums for exclusive deals and giveaways.
US Reseller -

Toywiz: http://www.ToyWiz.com
-They have great customer service, and offer the full range of BrickArms items, including BrickArms
protos.
-They OFTEN have sales on BrickArms items, as well as MANY giveaways.
-Visit their Flickr site or the BrickArms forums for exclusive deals and giveaways.
US Reseller -

- BrickMania: http://www.brickmania.com
-I have no experience with BrickMania.
Canada Reseller -

-BrickRepublic: http://www.brickrepublic.com
-They offer a wide selection of BrickArms products.
-I have no experience with BrickRepublic.
2)

BrickForge began with the collaboration between armothe and redbean combining to create a unique brand of BrickForge accessories to the LEGO community since 2006.
http://www.BrickForge.com
“We consider ourselves intermediaries between the community and the lumbering Danish company. For a long time the building experience has been the focus of creativity; but an increasing number of people are realizing their inner child through the role-play of the minifigs included in those sets. The mission of BrickForge is to fill in the gaps left open by LEGO and other brick-building companies.” – Armothe
“A lot of thought (and work!) goes into the creation of these tiny accessories. We do our best to consider ‘how would these look if LEGO made them’ and then we attempt to raise the bar even further.” – Redbean
BrickForge used to primarily offer items for LEGO fantasy realms, and they have some wonderful elements including headgear, body wear, and weapons to fill in gaps that LEGO has left unfilled. Today they also offer a number of items for a wide genre - some of my favorite items include their Halo...I mean Space Marine armor/Helmet, the newly released ODS...I mean Shock Trooper Armor/Helmet, as well as the ammo packs.
BrickForge offers great customer service and quick shipping!
3)

http://www.arealightcustoms.com/shop/home.php
Arealight customs offers some great items for the Star Wars enthusiast - if you're looking for a particular type of Clone armor or jetpack, Arealight probably has it! Not only do they provide some great Star Wars headgear/bodywear, but they also offer printed items that are very high quality!
4)

http://www.bricklink.com/store.asp?p=TinyTactical
For those of you into modern military, tiny tactical offers some wonderful additions for BrickArms weapons as well as several in-house weapons as well. They are based in Canada, and ship to a wide variety of locations - they are close enough to the border of the US that they usually ship through USPS, although I find that shipping does take a little longer; however, the products are well worth it. The only downside - the prices do add up pretty quickly. I do highly recommend using Tiny Tactical, although it may not be as suitable for the young Lego enthusiast.
5) A Minifig.Cat
http://www.bricklink.com/store.asp?p=Minifig.Cat
This store is based in Taiwan, and offer Lego-suitable accessories. When I first found A Minifig.cat's store, they were largely oriented towards accessories for asian cultures including samarai headgear/bodywear, in addition to many other items. They also offer items in the "Modern Military" vein which includes bodywear, headgear, and weapons. I would suggest ordering items in single quantities to start with, as some items do not fully fit within the LEGO minifigure anatomy (which includes many of the newly released rifles); however, some of my favorite items from A Minifig.cat include their Nightvision goggles, their black Marine Headgear (baseball hat), their Combat Knife (Bayonette L13), and their "belts".
6)

http://www.brickwarriors.com/
Ships to US AND Canada.
BrickWarriors is new in the Lego Accessory Vendors realm, although they seem to have some great items (I haven't had a chance to order from them yet) - they offer headgear, bodywear, and weapons, and fill several niche's that haven't been available previously.
"BrickWarriors accessories are all designed to fit seamlessly with your Lego® Minifigures.
They are produced in high quality ABS plastic – the same plastic used by Lego®. "
7) Amazing Armory
Amazing Armory does NOT seem to be around anymore although their products are still available at FireStar Toys (discussed below) - the price is higher when compared to other Lego Accessory Vendors. They offer headgear, bodywear, and weapons - I find the headgear often has problems of sticking on the minifigure head or is to loose, and I find the weapons aren't always designed with minifigure anatomy in mind; with that, I did like the wide array of items available from them as well as the level of detail that they presented.
8) United Armory

http://www.bricklink.com/store.asp?p=UNITED_ARMORY
This was began as a store that was linked with Amazing Armory, however, with the problems that came up from Amazing Armory's choices, United Armory no longer offers their products. With that said, Pedro currently offers custom Printed Joker Heads (from the Dark Knight movie), and will soon be offering their own products which will be comparable to the Amazing Armory items (a joint venture between Pedro and Pecovam on Flickr). This will include some great Halo armor, modern military elements, and other unreleased information. These should be available around November 1st!
9) Fine Clonier Customs

http://www.fineclonier.com/
This site primarily offers decals for customizing minifigures, but it also offers several hand-molded items. I have used them for their decals, which are high-quality designs, but have not had the opportunity to order any of their molded materials.
10) Unknown Artist

http://www.unknown-artist.com/
Unknown Artist creates some really wonderful cloth accessories for use with your LEGO figures - they fit perfectly, and are VERY high quality. I personally love the hooded cloaks (which can be a little fragile at the hood, so be careful), and I also really love their trenchcoats and the BrickArms knife/machete holsters. The hand-molded Vibrosword is also unique, and good for your Mandalorians or other Star Wars figures. I will say - one of the biggest selling points for Unknown Artist, at least for me, is that they offer actual sleeves on their trenchcoats and robes, although that does also raise the price.
11)

http://www.mmcbcapes.servaus.net/
MMCB offers cloth accessories, which are VERY high quality, and are competitive with Unknown Artist in terms of quality.
12)

http://www.firestartoys.com
This company is based in the UK, although they do ship internationally. They offer a wide-array of Lego-compatable Accessories (including many listed above), as well as a wide variety of custom figures (which Customizers Corner will offer with reviews on another day). I have not used this company, so I can't speak for any of their services.
13) BrickTW
http://www.bricklink.com/store.asp?p=bricktw
I haven't utilized this company in the past, but it appears that they offer items that are similar to A Minifig.cat's store.
14) Shapeways
http://www.shapeways.com
Although this is not fully a Lego Accessory Vendor, this site allows user to upload CAD designs and "print" their items. This has been a great resource for many, and has certainly been utilized by LEGO fans who have created items including LEGO compatible lighters to Halo armor/weaponry. The prices are high, and the quality is not very high, but it does offer some unique options, as well as the ability to design a piece that you need for a figure and print it yourself. I have not bought anything from shapeways, but have seen several items that have intrigued me - you do have to be careful with what you buy - depending on the designer, the items may or may not be sized correctly for Lego minifigures.
This list is by no means complete, but it offers a great starting point for the Independent Lego Accessory vendors available to those of us who want to expand our LEGO universe, or fully jump into LEGO customization. I hope that this has helped, and please feel free to add any other companies that you like, or your thoughts with the retailers mentioned above.
Family Bricks




