Perdido Street Station was the first book I read by him, and I found the first 200 pages or so painfully slow. In fact, I put it aside for a month or two. Eventually (and thankfully) I went back to it. It really picks up. The Scar is fantastic and the third book in the series was also very good (although a bit too blatantly communist for my taste).
http://knuttz.net/hosted_pages/Vinyl-Clock-20070621
http://tivac.com/images/backgrounds/
http://superpunch.blogspot.com/2007/05/3-images-darth-vader-playing-violin-and.html
http://superpunch.blogspot.com/2007/05/armored-carp.html