The Mezzanine

Hmmm, comics. Well, first up, I have a short list of webcomics that I read regularly in my sidebar, here: http://guy-who-reads.blogspot.com/ - it's about half-way down on the left. Some of them are good, some are excellent, some are mediocre. Girl Genius has been recommended above, so I'll just add a +1 to that rec.

Second, Scott McCloud's Zot! is worth taking a look at - it's been fairly recently collected in book form. It's arty and black and white, while still retaining a great deal of the form and feeling of a traditional superhero comic.

There was a further rec, but I can't remember the title, alas. Perhaps it will come to me.