Is it possible to create a Stack site for support/questions about a private website? I have a client at the moment for whom this type of Q&A site would be ideal.
Stack Exchange 1.0 was available but didn't work as expected so Stack Exchange 2.0 was launched over at Area 51 as a community driven approach. You propose a site and if enough people support it, it goes into beta mode. If there's enough traffic it emerges as a fully fledged site.