Microsoft has just made a Sneak Peek of SharePoint 2010 available on http://sharepoint.microsoft.com:

• 2010 Sneak Peek Home: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/default.aspx
• 2010 Sneak Peek Overview Video: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/Overview-Video.aspx 
• 2010 Sneak Peek IT Pro Video: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/IT-Pro-video.aspx 
• 2010 Sneak Peek Developer Video: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/Developer-video.aspx 
• 2010 Sneak Peek Get Ready: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/Get_Ready.aspx
• 2010 Sneak Peek FAQ: http://sharepoint.microsoft.com/2010/Sneak_Peek/Pages/FAQ.aspx

More details are available on the SharePoint Team blog:

http://blogs.msdn.com/sharepoint/archive/2009/07/13/announcing-sharepoint-2010-technical-preview.aspx