MSDN SharePoint
http://msdn2.microsoft.com/en-us/office/aa905503.aspx

TECHNET Sharepoint
http://www.microsoft.com/technet/prodtechnol/office/sharepoint/default.mspx

Developer Portal
http://msdn2.microsoft.com/en-us/office/aa905503.aspx

BLOG
http://blogs.msdn.com/sharepoint/

.NET 3.0
http://msdn2.microsoft.com/en-us/netframework/default.aspx

Architecture
http://msdn2.microsoft.com/en-us/architecture/default.aspx

Dev Center
http://msdn2.microsoft.com/en-us/developercenters/default.aspx

New articles on MOSS (capacity planning)
http://technet2.microsoft.com/Office/en-us/library/3e3b8737-c6a3-4e2c-a35f-f0095d952b781033.mspx?mfr=true

Web Service Interoperability
http://msdn.microsoft.com/webservices/webservices/building/interop/default.aspx

People Ready MOSS
http://www.microsoft.com/business/peopleready/info/product.mspx