RadControls for ASP.NET AJAX 
Q2 2010 release
Since Q2 2010 all new functionalities are listed in the control's Release Notes posted here.
What's New in RadSiteMap for ASP.NET AJAX Q3 SP1 2009 (Version Number 2009.3.1208)
What's New in RadSiteMap for ASP.NET AJAX Q3 2009 (Version Number 2009.3.1103)
- RadSiteMap has just been added to the RadControls for ASP.NET Ajax suite.