The general subject of social software (including but not limited to bookmarks shared among many people, most of whom never meet except via the medium of the Web) has absorbed a good deal of my attention in the last six months. I haven't started messing with Webjay myself until quite recently, and like most such environments I'm finding that its utility grows rapidly with use. Others have been at it longer, and have developed some really cool approaches. Take a look/listen at/to Chris Corrigan's rolling list of world music ("My own ever-changing top 40 of eclectic world music ...).
Today I happened upon a large collection of 1940s-1950s Bollywood filmi music and put one particularly tasty item into my newly-established Bollywood playlist (try it out --Bogi Bogi Bogi).
I have the feeling that my playlists could grow explosively, if I turned my attention in that direction. Would that be ...ummm... wise?
phauly (Paolo Massa) seems to be covering the bases very nicely, though I've only begun to explore the riches he's gathered in his playlists.