This is a nice hard-backed overview of all things Steampunk.
If you're already heavily into the genre, I'd guess that you may be familiar with a lot of the material you'll find here, but I'd also be willing to bet that you'll find some new treasures too.
Beautifully illustrated on high-quality paper, it covers everything from the historical roots of Steampunk all the way to its possible future directions. In between, you'll find sections on the literature, the graphic novels, the movies, the fashion, the artwork and 'toys', and frankly, just about everything else you could wish for.
I've attached a short video flip-through, to give you a rough idea of the physical appearance of the book. As you'll see, while it's lavishly illustrated, it doesn't skimp on textual content at all.
Personally (as a fan of most Steampunkiana) I purchased this mainly from curiosity and because it was by Jeff Vandermeer. I'm very glad I did. It's a delightful book, and I can't think of many ways it could have been improved... perhaps short of publishing it in Victorian-style antiqued leather, or something... now THAT would have been nice!
Anyway, it's a great, well-produced book and at a low price. Definitely recommended.