Have you read Epileptic or the Persepolis books, yet? Tracking down Milt Gross' "He Done Her Wrong" is also interesting (no words, published in the 1920s).

Yeah, 'Powers'.

It does the pomo superhero thing (stay with me now), but does it from the perspective of normal human detectives who have to try to do their job with all this annoying 'super' shit going on in the background. The strength of the book is Bendis's dialog. I enjoy the art too, though its kinda simple, the page ad frame layout is often pleasing to the eye. The art reminds me a little of what 'samurai jack' was able to accomplish with minimal (cheap!) lines and little to no animation.

This 'genre', if you will, was begun by Alan Moore with 'Watchmen', which is incomparable and you must read it.
I have not enjoyed Moore's other work, but I am in the minority.

Miller has so many strengths its hard to know where to start.
My favorite books by him are his 'Sin City' series. The art is breathtaking and I love the character 'Marv' from the first book published originally as "Sin City" and later as "The Hard Goodbye". The rest of the Sin City books are quality fun too, (I never liked Dwight's stories all that much though).
Miller's '300' has great art, if a very simple story and cheeseball dialog.
He's done a lot of superhero work as well. I've enjoyed "The Dark Night Returns" which chronicles Batman's return to action at age 60. His "Batman Year One" book was pretty good too.

Oh. I forgot to mention Johnen Vasquez. I really liked his Johnny The Homicidal Maniac books. Much more humor oriented than any of the above titles. His Johnny and Squee books landed him a brief tv cartoon series 'Invader Zim' which I remember amusing me.

While I'm at it I'll reccomend an adult title. I think Michael Manning's Spider Garden books are good. That sort of thing tends to depend a lot more on individual taste, but his art is represented here. Warning porn that may not be to your taste at the end of this link:
www.obsessionart.com/find.asp
www.artatlarge.com/pages/RE...nning.htm

Oh, how can I talk about adult titles without mentioning 'Small Favors'? Colleen Coover writes this adorable book about girls kissing girls and everyone being happy and cute that is an enormous breath of fresh air from the 99% of adult titles that are horrible gross icky misogynistic tripe (like porn in general). If pretty girls make you happy, I cannot recommend it enough. She is also a swell person.

What kind of things have you already read and liked?

Powers is indeed great, and Bendis has a lot of other graphic novels under his belt - more noir stuff than Powers (not super hero books). I think he writes some of the best dialogue in comics.

Astro City, by Kurt Busiek, for more stuff sort of like Watchmen, in that it's about human super-humans. I like the Tarnished Angel, Family Album, and Confession better than Life in the Big City, but they're all good (except the current run, which I don't much like).

Cerebus. You want to see a writer evolve? Read this series. Actually, at some point he evolved right past the point where I kept buying, but I would never, ever get rid of anything by Dave Sim. And I might still buy the ones I don't have, sometime when I'm feeling flush.

Concrete (Paul Chadwick), if you like sensitive pony-tail guy ecological comics.

Maus (Art Spiegelman), of course.

Nausicaa of the Valley of Wind by Hayao Miyazaki might be my favorite Japanese comic ever (hm, sensitive and green also). Sanctuary (Sho Fumimura) is pretty damn good too. It's political, and neither sensitive nor green.

Adrian Tomine (Summer Blonde and Sleepwalk), for short, depressing vignettes, again if you like that kind of stuff.

Kabuki - also an evolution. David Mack's early Kabuki has a great story and nice art, but you can really see him grow into his really unique style as each book comes out.

Girls is a relatively recent series. I don't buy the single issues because the story moves too slowly and I'm not really into the art, but the overall comic is so great I check for the next collection EVERY TIME I hit the store. I actually don't like any other comics I've bought by the Luna Brothers, but for some reason this one is really great.

Invincible is another great book by Kirkman, lighter than The Walking Dead, which someone else mentioned.

And for super cute, super light, super quick reads, you could try the Courtney Crumrin or Blue Monday books. Girl Genius is cute, light, and hilarious, but not broken up into quick reads.

And everything everyone else said, too. :)