The next major milestone in the release schedule for Dynamics CRM 2011 has been reached with the Release Candidate being available for download:
Download Dynamics CRM 2011 Release Candidate
This is said to be the last externally available release before RTM.
It seems that although the Team blog states that "On-premises Beta databases can be upgraded to this new RC release which can then be upgraded to the upcoming RTM release.", what that actually means is that you must un-install your Beta 1, install RC1, and then import the organisation database using the deployment manager.
Read more on the Dynamics Team Blog