Check out the following blog post from Marco Amoedo for a list of new CRM 5 features. http://marcoamoedo.com/blog/summary-of-xrm-and-crm-5-at-pdc09/ Solution Packaging Net 4.0 Support out of the box Flexible Web Services Using System Types Linq for CRM ADO.Net Data Services and .Net RIA services support Code Sandboxing Claims based Authentication and Federation Shared Picklists