Creative Commons has just released version 3.0 of their license, and I have relicensed everything on this site (apart from the out-of-copyright stuff, which remains public domain) with this latest license. Unless you're planning to reuse my material, that will be of no interest to you, but it does give me a chance to praise the good folks at Creative Commons for their invaluable work promoting the ideals of free culture. And even if you are planning to reuse my material, the broad points of the license remain unchanged, but you should make sure you understand the fine points.