I've been meaning to post this here for a while...
The Chicago Python Users Group has started a book club. But everyone is invited; we plan to mostly do this on a mailing list, so you need not be in Chicago. This is a chance to do something a little more computer-sciency, purely to expand your mind.
Our first book is Concepts, Techniques, and Models of Computer Programming. What particularly appealed to me about this book is that it's in Oz, which (alongside Erlang) is known for its strong support for concurrent programming. It's also a fairly strict functional programming language, so if you haven't tried functional programming there's a lot to learn about that too. The book reminds me a lot of the venerable SICP.
So, if you are interested then stop on by. We've been a little slow starting up, which means it's not too late to join. If everything works out well, we'll probably do another book when we're through with this one. But this book is fat, so that might be a while.
The authors of "Concepts, Techniques, and Models of Computer Programming" used to have a PDF of the book available to download from their website.
If you wish to preview before purchasing a paper copy, the way back machine still has a copy of the file here:
http://web.archive.org/web/20040206041220/http://www.info.ucl.ac.be/people/PVR/booksingle.pdf# Jacob Greene