Opensource is a funny old game, we do it for love (of software) and not love of money. You work when you want and how you want. You get to use technologies and explore ideas that are not constrained by your management\clients. You also get to work with and learn from some of the brightest minds in the industry. You just don't get paid for it, something has to give :)
As many of you might (or might not) know I run a OSS project called MbUnit, and its a busy time on the project. We are fixing bugs and adding small features and the 2.4.1 release is shaping up. We are working very hard on shaping up the documentation and website. We also have MbUnit Gallio underway, I'll be talking more about that later in the year. MbUnit has an amazing set of folks working all day and night on it but I'd like to attract more folks to the project, helping to fix bugs, write some cool docs (even cool articles would be appreciated), in a nutshell spare me any time you have. If you think you can, drop me a line on the contact form and we can talk.