License

I, for one, would never make a significant contribution to a non-copyleft project. And while I don't mind GPL2 that much, when a developer contributes to Linux, he has to bear in mind that he is also contributing to TiVo and other companies like TiVo, which will use his code against the spirit of the license under which it was released by exploiting loopholes in the license. Everything else being equal, I would definitely choose to contribute to a GPL3+ project over a GPL2 project.