1 - To ask other people who make comics how they do it and what materials they use.
2 - To ask questions about distribution methods and finding affordable and good printers.
3 - To discuss web based distribution and digital creation.
4 - To discuss the basics of page layouts and typesetting.
5 - To post pages or strips for general critique with a focus on sequential art as opposed to pinups.
6 - To announce new projects.
7 - Industry gossip. (And I don't mean whether superdude's new costume is dumb. There are places for fanboy gossip too.)
8 - Announce conventions (if you are a con looking for artists) or convention appearances.
9 - Job postings or submission calls