I have main Q&A site and i have done many Q&A sites ...user wants to login through my main site or sub domain site..
It is possible ...
My site http://asktoweb.com/ is main website.i have many sub sites are like http://boardgames.asktoweb.com/,http://anime.asktoweb.com/ more like..
Check this may any of this helps you.
http://www.question2answer.org/qa/24851/tutorial-setup-multiple-question2answer-website-wordpress?show=24851#q24851
http://www.question2answer.org/qa/5622/multiple-q2a-sites-with-shared-user-base-in-1-4?show=5622#q5622
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