Some nice sections and the new SDK for Microsoft CRM

Version 3.0.5 of the Microsoft CRM 3.0 is now available on MSDN online! This version of the SDK includes new sample code, consolidated attribute information, topic enhancements, and bug fixes. Get a full look at it here: http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0microsoftcrmv3d0sdk.asp

You might want to see specific items so i would suggest in taking a look at these sections of the SDK:

ISV Programming Guide: http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0isvguidelines.asp

Support and Certification: http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0supportandcertification.asp

Customization Points: http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0customizationpoints.asp

Develop and Deploy: http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0developanddeploy.asp

Best Practices:
http://msdn.microsoft.com/library/en-us/CrmSdk3_0/htm/v3d0bestpractices.asp