The below items were introduced in CRM 2011 as compared to previous version 4.0
- Assigning records to teams
- Adding related items grids to forms(now it is configuration)
- Lookup fields(easy creation)
- Dashboards(Wizard based erport creation is available)
- Share-point 2010 integration
- Auditing(configure auditing for an entity down to the attribute level)
- Role based forms
- Global optionsets are available we can use more than one form
