This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
Another one, a bit more esoteric, is 'Beautiful Code' by Andy Oram and Greg Wilson (O'Reilly press). It's a series of essays, by the people that wrote them, on pieces of code that they're really proud of (including that venerable old chestnut: Regex).
Being a collection, the writing varies a bit, and some of it, admittedly, goes over my head; but there's some fascinating stuff in there. And it highlighted a problem in binary chops for me that I had all but forgotten about (and that went undiscovered for 8 years in Quicksort).