Here's a pretty cool web comics site, appropriately called Web Comics Nation. Here you will find a plethora of online comics in just about every genre known to man. They're neatly organized on their side bar, so you need not fear getting lost.

http://webcomicsnation.com/

There's something here for everyone from both novice and professional talent, featured artists to lots of buzz. Its a really interesting site where you can even post your own ongoing comics for free. (No, I haven't posted anything. I'm still working on trying to finish The Virtutus Key, so I can start submitting it to a few publishers.)