FreeToBeGeek: Geek focused Linux shirts.
Geek Shop: Linux and Tux shirts.
Hackerstickers Clothing: T-Shirts and hats for geek guys and girls.
Load Rage: Retro gaming designs.
Nosediver Tech Apparel: Designs for programmers, linux hackers, and open source coders.
NTKmart: Anarchic geek designs for those that Need To Know. UK-based.
OffLine: Featuring MMORPG, computer lifestyle, and fantasy shirts.
Omega Impressions: T-shirts and baseball shirts with a small collection of geekish slogans, including a NetHack screen shot.
Openstuff: Linux/Tux, Debian, and FSF shirts and ties, plus other open source clothing and novelty items for European geeks.
ShirtMonger.com: Linux and classic video game designs.
SplitReason.com!: Gamer and gamer logo products, t-shirts, Stikfas and Super Mario toys.
SysWear: Humorous computer-oriented t-shirts.
Wonkwear: Small collection of T-shirt slogans for gamers, geeks, and sysadmins.