Promoting companies is not going to become a regular thing on Ruby Inside, but Guruza struck me as quite interesting. It's a Google Answers style site but in a Web 2.0 vein. Interestingly, though, there are quite a few people asking and answering Ruby questions on there (whereas I've found other questions sites to be thin on programming stuff). Check out the latest Ruby questions. People asking questions specify an amount in dollars of how much they'd pay for an answer, and if you satisfactorily answer the question, the money is yours.

If the smell of money makes your head spin, then there's always Rails Weenie, a pretty amazing, free, Rails questions and answers system managed by Rails god Rick Olson.