I recently created an open source framework for Windows Phone 7 development, and started writing an FAQ on my GitHub wiki. I then realized that these questions are more likely to be asked on Stack Overflow (if anyone actually starts using the framework, that is...)
One thing that struck me was that I could ask these questions on Stack Overflow, and then answer them myself - with the added benefit of maybe making someone else interested in having a look at the framework. But, would that be douchy? I know that it is even encouraged to answer your own questions, but I'm afraid I will get bashed for trying to plug my own project..?