I almost always end up usign MIT or BSD (they're equivalent), since it
- Is the most liberal license out there. It just says you're not responsible for any kind of trouble, and optionally forces people to include a copyright notice of your original work in derivatives.
- It allows closed source derivatives, which is something I see as a good thing: companies sometimes don't have the possibility to do their work under the GPL (they may themselves use products or components from a third party with restricted licenses).
That, and the GNU/GPL bunch are generally extremists when you encounter them in the wild.
