rock poster sites

Art of Jerry Tidwell - nice range of genre's - really good integration of words
http://humantree.com/artwork/rock-posters-2

Dan Stiles - Very Design oriented- you can definitely tell the posters are his design.
http://danstiles.com/posters-the-roots-ac-newman.html

A blog with tagged images of rock posters with links to other rock poster artists
http://www.changethethought.com/tag/rock-posters/

A huge archive of gigposters - not all screen printed, but posters all the same.
use the browse buttons on the top left side of the menu to browse through the posters:
http://www.gigposters.com/poster/19471_Radiohead.html

A nice site with classic and modern rock posters
http://www.dking-gallery.com/

http://swampco.com/

http://www.posterbomb.com/

http://www.posterscene.com/html_index.cfm?page=home