Upgrade from Teamsite 6.1 to Teamsite 6.5

System

Just starting to look at Teamsite 6.5 and what it would take to upgrade our existing Windows 2003 servers that are currently running Teamsite 6.1to Teamsite 6.5.

Has anyone done this or come across any gotchas in the process of the upgrade?

Any tricks to the upgrade?
I had heard there was a recommended amount of editions per branch with the new release that sets a maximum of 500 editions per branch. Is this true?