I have noticed that there's not much worth in posting on obscure subjects (reputation point wise). Is it possible to weight some tag or categories in order to get a more balanced representation?
Another problem I have found is that popular doctrine is often short sighted. Consider a post such as 'yeah but jquery is awesome and it's what everyone is using so there' is likely to get 100 up-votes, whereas a post saying 'jquery is flawed because of a b and c' is likely to get down-voted because of the massive fan base. Anyway, that's not a side-swipe at jquery btw, I happen to be a fan of jquery.
That really is a side discussion, so for now, what could be done to reward posts in a way that doesn't just favour the popular topics?