At BEA last year, I somehow got called out in front of a group of people to answer questions about steampunk comics, which I more-or-less failed miserably at. As it's starting to be that time of year again, I am preparing with a short list!
Did you ever read Kazu Kibuishi's Amulet series and think, where in the world did this guy come from? How did he become this awesome? This is the first book by Kazu I ever read, and it unfortunately it does not answer that question at all, because even it is awesome. It is full of gunfights and robots in the wild west! And also girls who are the law.
I really like the idea of Captain Nemo's submarine being a steampunk marvel. He is full of science and guns and things, and then all of the European Nations are forced to acknowledge the superiority of the culture of the East! (Okay, it doesn't quite work like that, and that might not really be the point in this book. . . .)
This is one of my favorite books First Second has ever published. It's got lovely art (courtesy of Emmanuel Guibert). And lovely writing (courtesy of Joann Sfar). And also Queen Victoria is thrown into the Thames! Steampunk doesn't get much better than that.
Steampunk + time machines! This may count as the first steampunk comic I ever read, because I read it in college (before I ever knew that steampunk existed!). If you're versed in steampunk, this may be the book on this list you haven't heard of; it's definitely worth checking out.
Webcomics recommendation: if you need something steampunk-y to read RIGHT NOW, you should go read Lovelace & Babbage. Ada Lovelace! Charles Babbage! Together they fight crime! Also musicians!
Plus bonus kind-of recommendation: I have somehow not read Doug TenNapel's Iron West, presumably because I am lame and also insufficiently organized. But: it is a steampunk western! By Doug TenNapel! There seems to be very little probability that it is not all sorts of fun.