Besides Microsoft.com, MSDN and TechNet, here are 5 SharePoint resources I recommend bookmarking/subscribing to:

• SharePoint Team Blog
• http://blogs.msdn.com/sharepoint 
• SharePointPedia built on SharePoint technology! [new]
• http://www.sharepointpedia.com
  
• CodePlex
• http://www.codeplex.com/Project/ProjectDirectory.aspx?TagName=Sharepoint
• Community Kit for SharePoint (CKS)
• Accessibility Kit for SharePoint (AKS)
  
• SharePoint Community Portal
• http://sharepoint.microsoft.com/sharepoint
  
• SharePoint Forums
• http://www.mssharepointforums.com