SharePoint Server 2007 Solution Center
SharePoint Server
SharePointFeeds.com
SharePointPedia
Technical Articles
Visual How Tos
Welcome to the AKS Portal
Windows SharePoint Services Resource Center Map
Help for Windows SharePoint Services 3.0
You will not go outside of this list when you develop sahrepoint solutions, it's very helpfull :)
I have some more links that gives lot of solution to Sharepoint problem www.ekhichdi.com/Software-43.html