*They’re using Jabber, an open protocol rather than their own proprietary system.
*They allow and support the use of other IM clients rather than
deliberately blocking other software as Yahoo, AIM and MSN have done.
*It works off your GMail account which doesn’t expire like hotmail and AOL accounts
*Builtin GMail notifier
*Free with no ads
Mark Evans discusses what this means for Skype. Seems like this will bump Skype’s numbers up a ways.
Below is a screenshot I just took.