You can download the Release Candidate version of Microsoft Dynamics CRM 2011 from the Microsoft download servers at http://downloads.microsoft.com. Here are the specific links to the various packages that can be downloaded:
Locations:
This is still a pre-release version of the software, so this is not the final Release to Manufacturing (RTM) build. There is a CRM 2011 launch event planned for January 20, 2011 where information about the final release will be shared. If you would like to watch the launch event, you can find more information and register here: http://crm.dynamics.com/2011launch/