A few people have asked if they can use stuff on this site and, if so, what license is it under. Thus, anything that does not explicitly state what license it uses falls under one of the two given here -- one for code and one for text. Both are variants of the Creative Commons License.
If you want to use anything here in a way that the license doesn't permit, contact me and we can probably come to some kind of arrangement. Although I have allowed commercial use of this stuff (I don't have the resources or the inclination to stop you anyway) I would appreciate some kind of donation (a free copy, at least) if you make money off it.
Why two licenses? I don't really want people making derivative works of my text, but I'm happy for them to do what they like with my code as long as I'm credited.
Code is licensed under the Attribution-ShareAlike 2.0 license. This basically means that you are free to copy, distribute, display, perform, make derivative works and make commercial use of the work on condition that you give me credit. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one.
Anything that isn't code is licensed under the Attribution-NoDerivs 2.0 license. This basically means that you are free to copy, distribute, display, perform and/or make commercial use of the work on condition that you credit me and do not alter, transform, or build upon it.