Microsoft Virtual Labs:
TechNet Virtual Labs: 2007 Microsoft Office System
Microsoft® Office SharePoint® Server 2007 Installation and Configuration
Creating Workflows for Windows SharePoint Services
Getting Started with the Business Data Catalog in Microsoft® Office SharePoint® Server 2007
Videos:
2007 Office System Video: Portals
Conference Videos: Windows SharePoint Services Platform, Collaboration
Sharepoint-Screen-Casts
Microsoft Most Valuable Professional (MVP) blogs: Microsoft MVP Awardees – Sharepoint Server
Andrew Connell
Heather Solomon
Vivekthanga Swamy
Stephen Cummins – SPSFAQ
James Mueller – SharepointCommunity
Bil Simser blog
Mike Walsh
Mohamed Zaki
Chris O’Brien’s blog