There are a number of documentaries about comics, and now PBS is serving up a documentary on webcomics.
The internet has given birth to yet another new medium: webcomics. Moving beyond the restrictions of print, webcomic artists interact directly with audiences who share their own unique worldview, and create stories that are often embedded in innovative formats only possible online. Sometimes funny, sometimes personal, and almost always weird, web comic creators have taken the comic strip form to new, mature, and artistic heights.
Christina Xu, Breadpig http://breadpig.com/
Nick Gurewitch, Perry Bible Fellowship http://pbfcomics.com/
Sam Brown, Exploding Dog http://explodingdog.tumblr.com/
Lucy Knisley, Stop Paying Attention http://comics.lucyknisley.com/
Andrew Hussie, Homestuck http://www.mspaintadventures.com/