Training Examples Q&A is a site created by Joseph Turian where “data geeks ask and answer questions on machine learning, natural language processing, artificial intelligence, text analysis, information retrieval, search, data mining, statistical modeling, and data visualization!”
It’s a close knock off of the popular stack overflow site and appears to be very well done.
If it catches on in the relevant research communities, it could be a very useful resource. (via LingPipe blog)