mobimii - I’m not going to list all the features, but it’s basically a mobile social network, think MySpace for your phone…your own profile, file host, blog, friends, news…and the basics like, to chat with anyone just send a message with their username as the first word to 35050.
mEgo - lifestream widget
Orgoo update - I mentioned Orgoo a while back, and it seems it’s another centralised service that aggregates your profiles, but this time not lifestreaming, instead it aggregates your email boxes, IM and allows you to create and host video email, along with video chat and chat rooms.
Fuser is in the same area, they have email aggregation and social network notifications, posting, and analysis,
LoudTalks - an online Walkie Talkie…audio type of IM tool, if a friend is not available it leaves as a message, also send a blast to multiple friends.
Also check out Yackpack Walkie Talkie, and ChinSwing for an audio forum/chat.