The SharePoint Products TechCenter on TechNet has been updated to include documentation and resources specific to Microsoft SharePoint Server 2010.
The SharePoint Products TechCenter beta resources include categorized documentation and guidance on planning, deploying, and operating Microsoft SharePoint Server 2010 and product evaluation guides in addition both to resource centers and technical references specifically designed to provide both general product and feature overviews, guidance on managing privacy, permissions, read-only sites and more. Also available for Microsoft SharePoint Server 2010 are the SharePoint 2010 (Beta) Developer and Upgrade Resource Centers.
Be sure to also find out who's talking about SharePoint 2010 on Twitter, Delicious, YouTube, and Facebook at the SharePoint 2010 Community.
SharePoint Products TechCenter
SharePoint 2010 (Beta) Developer Center
SharePoint 2010 (Beta) Upgrade Resource Center
SharePoint 2010 Community
SharePoint 2010 Forums