Why one license over another?

I'd be very interested in hearing from folks that have distributed code using a free software license (copyleft or non-copyleft) - to ascertain what their decision making criteria was in using a particular license. Why the BSD or MIT licenses as opposed to the GPL or vice-versa? (for instance).

In Chapter 2 of "Decoding Liberation" (the abstract of which I will post very soon) we evaluate free software licensing schemes, and in order to give this a bit of an empirical flavor it will be very interesting to hear from programmers themselves on what sort of criteria they worked with when making their decisions.