I like the idea of friendfeed
Though they need to improve friendfeed quite a bit for it to really make absolute sense. Though the ex-Google people who previously created Gmail, Adsense, are now working on friendfeed, if they make it right, friendfeed could replace IRC, IM and twitter. I would like it if it will be possible to filter the friendfeed chat room by users, to filter up highly rated users by the amount of likes that their entries get, and filter up quality entries in real-time. Especially it will be good to thus automatically moderate real-time discussions on topics when a lot of people are chatting about them at the same time.