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Indices : Merchandise
House Industries has everything from posters and magazines to clothing and furniture:
http://houseind.com/index.php?page=merchandise
P22 Type foundry has an eclectic selection of shirts, books, audio CDs & hockey pucks
http://www.p22.com/products/merch.html
Mark Simonson has some great lettering tees available through cafe press.
http://www.cafepress.com/marksimonson
Veer has a great selection of books, typo tees, posters and even lamps!
http://www.veer.com/products/merch
Discussion:
Typography T-shirts