Sites at Microsoft
Microsoft Office SharePoint Server - default page at microsoft.com
SharePoint Server TechCenter - at Microsoft TechNet
Windows SharePoint Services TechCenter - at Microsoft TechNet
SharePoint Server HomePage - Microsoft Office Online
GEAR UP - An Excellent site to kick start your deployment and sell it to the enterprise
SharePoint Server 2007 Solution Center - @ Microsoft Help and Support
SharePoint Server Developer Portal - @ MSDN
Microsoft SharePoint Products and Technology Community Portal -
SharePointPedia - a compendium of useful content in a better than wiki fashion!
ASP.net - developer community
SharePoint Conference - links from the 2008 conference