I've never read a steampunk novel, but they've never appealed at all. I've heard a bit about Scott Westerfeld lately, too, especially his Uglies trilogy; but his latest book, Leviathan, is steampunk so I've never really paid it much attention.
Then I saw this book trailer for Leviathan:
I'm still not sure I'd read the book. I might buy Uglies, and decide based on that. But I do think that is an extremely cool book trailer.