I believe that we should try get our programmer friends at StackExchange HQ to program Mi.Yodeya into giving users extra reputation for asking and answering questions that fall into the Weekly Topic Challenge categories. Anything that falls into the certain weekly (or monthly?) tag categories (To Be Determined based on the week) should be fair game for this promotion.
I don't think they would do that just for Mi Yodeya. (And we sort of dropped topic challenges a while ago, and yes, i see the post date.)
However, now that SE is more endorsing weekly topic challenges, this might be a good idea to take to MSE.