Publishers:
AAA Pop Comics
Abstract Studios
Adhouse Books
AIT/Planet Lar
Alternative comics
Antarctic Press
APE Entertainment
Arcana Studio
Archaia Studios Press
Archie Comics
Aspen Studios
Avatar Press
BOOM Studios!
Broadsword Comics

Publishers:
Cartoon Books
Comics International
Dabel Brothers
Dark Horse
D.C. Comics
Del Rey Manga
Desperado Studios
Devil's Due
Digital Webbing
DMP
Drawn & Quarterly
Dynamite! Entertainment
:01 First Second
Fantagraphics

Publishers:
Gemstone
Heavy Metal Publishing
Humanoids Publishing
I.D.W.
Image Comics
Kenzer & Co.
Marikosa
Marvel Comics
N.B.M.
Oni Press
Platinum Studios
Radio Comix
Red 5 Comics
Seven Seas Entertainment

Publishers:
Shoto Press
Sirius Entertainment
S.L.G./Amaze Ink
Tokyo Pop
Top Cow
Top Shelf
Twomorrows Publishing
UDON
Viper Comics
Virgin Comics L.L.C.
Viz Comics
Wizard Entertainment
Zenescope Entertainment

Creators:
Nobody has done a better job of profiling the vast number of comic book artists & writers than these sites, enjoy: