Xumii seems ideal for those who send a lot of instant messages and frequent social networks. It allows you to see and contact all your friends across all your networks with one easy service. That includes Facebook, MySpace, imeem, AIM, Yahoo! Messenger, Google Talk, MSN and Flickr. Xumii, which is free, creates a single social address book for you. You can chat with friends, share photos, and get status updates across all your networks. YouTube has a video demo.
Xumii also lets you see who's online and available to chat, update your status once for all communities, see everyone else's status in one place, and grab a photo from your phone, Facebook, MySpace or Flickr account and share it with a friend on IM.
In addition to the iPhone, it's available for Motorola, Nokia, Samsung, Sony Ericsson, Blackberry, LG, Sanyo, and other java phones.