A number of expert testers like James Bach have put their bookshelves online and I talked about them here: http://sqa.stackexchange.com/a/2685/1455https://sqa.stackexchange.com/a/2685/1455.
Basically what I said was software testing expert James Bach has a growing list of books on his Tester's Bookshelf that are worth looking at: http://www.librarything.com/catalog/satisfice/testersbookshelf
James Whittaker has a new book coming out How Google Tests Software but that won't be available for another month or so.
I'm in the middle of reading a few books: Amplifying your Effectiveness by Gerald Weinberg, James Bach, Naomi Karten and An Introduction to General Systems Thinking by Gerald Weinberg. Looks like as of 3/8/12 the Kindle version of Introduction to General Systems Thinking is less than $4.