By request, this post will create a place to find roommates for the 2012 cruise. Ning is no more, BN is a closed site, and Twitter is hard to keep up with, so hopefully this will help singles in search of the perfect cruise mate.
For reference, here are the cabin types and prices from 2011.
Do your cruise roommates a solid; don't book if you aren't sure you can afford to cruise.
Hope this is helpful!