This is one of the most blogged about topics of the day, but in case you haven't heard (I understand since there was a double-header on Monday Night Football tonight :-)) Microsoft's Scott Guthrie officially announced the name Atlas will be and gave a timeframe for the production release.  Read all about it here:

http://weblogs.asp.net/scottgu/archive/2006/09/11/_2200_Atlas_2200_-1.0-Naming-and-Roadmap.aspx