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What about Uclue? I haven't used it myself, but it looks like a pretty good replacement for Google Answers.

No, the problem is having incentives at all!

The only viable option is for it to be a part of a larger self-policed community, with no 'points' that count for anything: http://ask.metafilter.com

Google Answers had incentives and was much better for it.

Yeah, Google Answers was great. I still miss it.

We built it to exactly fit that niche: smart people, good incentives, and free.