When you finish the hardcover, try the ongoing semi-steampunk comic (the authors dislike that term) it's based on:

http://www.girlgeniusonline.com/comic.php?date=20021104

Updated MWF, and there's just short of a decade in the archives. The first chapter / prologue is sepia-toned, and the rest is glorious color. Safe for work, and thoroughly addictive.