I've been thinking a lot about this lately, though I haven't been able to participate much (the AP tests are going on, and I thus barely have time to come online). How about starting a blog for physics overflow? It could be a group blog, like that of the \(n\)-category cafe, where users can post ideas of theirs (research ideas), and the blog can be used as a means to have discussions online. Are you interested? If yes, then vote up. If not, vote down. (If I see a general "yes", then I'll post more suggestions for the blog.)