Google stopped their useful answers and I am wondering whether they will restart it again. I don't know why they stopped it as many people are making money with it.
I might just be being thick here, but what do you mean by useful answers? And who are asking the questions?
I asked some technical questions at google answers and I got useful answer at very cheap cost $5-10 and it was answered by some knowledgeble people in that particular field. I found it quite useful.