Developer Ramp up Kit for Microsoft Dynamics CRM 4.0
http://msdn.microsoft.com/en-us/library/dd393296.aspx
Microsoft Dynamics CRM Demonstration Tools
http://www.microsoft.com/downloads/details.aspx?familyid=634508DC-1762-40D6-B745-B3BDE05D7012&displaylang=en

Business Productivity Workflow Tools Accelerator provides additional workflow step actions for customers to configure their workflow processes. Each custom action provides additional capabilities around string handling, mathematical functions and HTML hyperlink creation. Once this accelerator is installed workflow designers within Microsoft Dynamics CRM have more flexibility in terms of the processes they can manage through workflows
http://crmaccelerators.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=26691
Internet Facing Deployment (IFD) Installation Basics

http://blogs.msdn.com/crm/archive/2008/09/19/internet-facing-deployment-ifd-installation-basics.aspx

Design considerations for business units
http://www.microsoft.com/dynamics/crm/using/configure/businessunitsandsecurity.mspx
Extensibility Feature Deployment Comparison for Microsoft Dynamics CRM 4.0
http://msdn.microsoft.com/en-us/library/dd393297.aspx
Scripting Sample Code
http://msdn.microsoft.com/en-us/library/dd393297.aspx