Status/presence indicator like in Jabber/IM-Apps, but web-based. Nice gui, including display of friends etc.; integrates with Jabber/GTalk and SMS. Company seems to be an Odeo-spinoff.
Microsoft's bloggin, photo, social something. Seems pretty dead to me - it's online since september 2003, see also http://www.wired.com/news/culture/0,1284,61095,00.html