Main CRM landing page http://www.microsoft.com/dynamics/crm/default.mspx
Microsoft Dynamics CRM 4.0 Videos http://channel9.msdn.com/tags/CRM/
Using Microsoft Dynamics CRM http://www.microsoft.com/dynamics/crm/using/default.mspx
Microsoft Dynamics CRM 4.0 Code Samples http://code.msdn.microsoft.com/mscrm4
Microsoft Dynamics CRM 3.0 Code Samples – Some CRM 3.0 samples may be still relevant to Microsoft Dynamics CRM 4.0 http://code.msdn.microsoft.com/MSCRM3
Microsoft Dynamics CRM 4.0 Developer Center http://msdn.microsoft.com/en-us/dynamics/crm/default.aspx
Microsoft Dynamics CRM 4.0 Forums http://forums.microsoft.com/dynamics/default.aspx?siteid=27
Microsoft Dynamics CRM 4.0 SDK – note this updates every 4 weeks or so, keep checking for updates http://www.microsoft.com/downloads/details.aspx?FamilyID=82e632a7-faf9-41e0-8ec1-a2662aae9dfb&DisplayLang=en
Developing ISV Applications using Microsoft Dynamics CRM 4.0 http://www.microsoft.com/downloads/details.aspx?FamilyID=1217efff-be8f-4ac8-8e32-af367305fba9&DisplayLang=en
Microsoft Dynamics CRM Performance and Scalability http://www.microsoft.com/downloads/details.aspx?FamilyID=5852b14a-394c-4898-8374-caf5e6479eb0&DisplayLang=en
Microsoft Dynamics CRM Online Readme http://www.microsoft.com/downloads/details.aspx?FamilyID=d94bef12-a1e6-4862-a303-55bb181b5eae&DisplayLang=en
Microsoft Dynamics CRM 4.0 Implémentation Guide http://www.microsoft.com/downloads/details.aspx?FamilyID=1ceb5e01-de9f-48c0-8ce2-51633ebf4714&DisplayLang=en
Microsoft Dynamics CRM 4.0 : Planning and Deployment Guidance for Service providers http://www.microsoft.com/downloads/details.aspx?FamilyID=6e211231-30fe-4df2-9b81-15cfb87adcf1&DisplayLang=en
Microsoft Dynamics CRM 4.0 Logical Database Diagrams http://www.microsoft.com/downloads/details.aspx?FamilyID=b73912e8-861e-43ae-97b4-72b3e809f287&DisplayLang=en
Microsoft Dynamics CRM 4.0 Virtual Machine http://www.microsoft.com/downloads/details.aspx?FamilyID=dd939ed9-87a5-4c13-b212-a922cc02b469&DisplayLang=en