Besides Microsoft.com, MSDN and TechNet, here are 5 SharePoint resources that Arpan Shah (from Microsoft) recommends bookmarking/subscribing to:
1) SharePoint Team Bloghttp://blogs.msdn.com/sharepoint
2) SharePointPedia built on SharePoint technology! http://www.sharepointpedia.com
3) CodePlex
http://www.codeplex.com/Project/ProjectDirectory.aspx?TagName=Sharepoint
Community Kit for SharePoint (CKS)
Accessibility Kit for SharePoint (AKS)
4) SharePoint Community Portal
http://sharepoint.microsoft.com/sharepoint
5) SharePoint Forums http://www.mssharepointforums.com
Source: Arpan Shah's blogsite on msdn
