I finished Cat's Cradle by Kurt Vonnegut this weekend. I really enjoyed it. It is only my second Vonnegut, and I am looking forward to reading more. It reminded me a lot of Just a Couple of Days by Tony Vigorito in which something very small can destroy (or at least change) the entire population in a short period of time.
I am now reading Special Topics in Calamity Physics by Marisha Pessl (as well as HP1 and Reading Lolita in Tehran).