http://atlas.asp.net/default.aspx?tabid=47&subtabid=477
The Microsoft site for the Atlas Control Toolkit contains release notes and live demos.
http://www.codeplex.com/Wiki/View.aspx?ProjectName=AtlasControlToolkit
The community site for the toolkit is located at the CodePlex site, the new Microsoft site for shared source projects.
http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx
The Microsoft Permissive License is posted at the toolkit site, but this site explains it, and provides an overview of other Microsoft shared source licenses.
http://weblogs.asp.net/scottgu/archive/2006/04/13/442793.aspx
Scott Guthrie of Microsoft announced release of the toolkit in his personal blog, which is worth a read.