The Microsoft SharePoint Team has published a clarification for which Operating System versions SharePoint 2010 runs on. So if you are wondering which of your (old) machines can take SharePoint 2010 without change, take a look at the Operating System Requirements of SharePoint 2010.
2000 Item Limit Resolution With BCS And SharePoint Workspace ( 24 Oct,2010 )
PowerPivot Installation on SharePoint 2010 ( 29 Aug,2010 )
Sandbox troubleshooting ( 2 Dec,2009 )
How To Find Out Space Usage ( 1 Feb,2010 )
Report On Possible Vulnerability in SharePoint ( 5 May,2010 )