I do not want to claim that "thought has been put into" it, as it was more like a spontaneous idea, but for what it's worth I suggested recently in a "tea"-discussion on community relations that on a potentially to be created webpage for MathOverflow other than mathoverflow.net, presenting the entity and its community in a way somewhat detached from the main site, there could be a space for users to present themselves and the things they care about in a way more detailed than the userpage.
In addition, there used to be (or there is, but I do not think so the last time I checked it was down) something called PlanetMO, aggregating blogposts related to MO or also just using some specific tag. This service was kindly provided by http://www.mathblogging.org/ However, this never got much use so it "died" (basically).
If you intend a tighter integration with mathoverflow.net such ideas where also presented on occassion this other "tea"-discussion might be the most recent instances of something along these lines. But there seems to be considerable opposition against this by some (including me).