I know doing a topic of the week has been discussed before. What I'm suggesting is that even with out a reward we just start a topic of the week to generate more questions on this site during Beta. I also think that a general topic will generate more questions. Such as Classic TV Sitcoms would generate more questions then Sanford & Son. So should we go ahead and start a topic of the week?
I think that as long as we can build a list of topics that is long enough that we can be confident that the idea will not just die off, then I think that would be a good idea.
If this question gets enough support, then we could open another community-wiki question to collate and order the list of topics.
I think that people should upvote / downvote your question to register support or not. (also if people have points to make, other answers would also be welcome).