Finally finished Pohl's Coming of the Quantum Cats
, which was a lot of fun and one of the better multiple-universe stories I've ever read. I'm not sure which I find more amusing, the thought of Nancy Reagan as president or Stalin as a bank robber turned clothing tycoon.
Thanks a lot for the suggestion, it's a perfect example of why this is a crucially important thread!
On to Crompton Divided
by Robert Sheckley.