The 
ECF project has been adding some real-time collaboration functions for dev team support...for example, 
sharing selected text in Eclipse editors, as well as 
real-time collaborative editing...all over the 
ECF datashare API...which means you can use your favorite public IM accounts like 
google talk, or 
skype rather than be forced to have yet another account.  We've also got some new 
sharing of Mylyn tasks as per 
bug 195737.