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The SharePoint MSDN Developer Center
http://msdn.microsoft.com/sharepoint
Developers at MSDN
http://MSSharePointDeveloper.com
IT Pros at TechNet
http://MSSharePointITPro.com
Everyone at Microsoft.com
http://SharePoint.Microsoft.com
The SharePoint 2010 MSDN SDK:
http://msdn.microsoft.com/en-us/library/dd776256.aspx
SharePoint MSDN Forums:
http://MSSharePointForums.com
SharePoint 2010 Developer Evaluation Guide:
http://go.microsoft.com/fwlink/?LinkId=167784
An article on upgrading code from SharePoint 2007 to SharePoint 2010: http://msdn.microsoft.com/en-us/library/ee662217(office.14).aspx
Details of how to install SharePoint 2010 for developers on Windows 7: http://msdn.microsoft.com/en-us/library/ee554869(office.14).aspx