I am running Vista build 5520 (and loving it finally) but had a problem installing Expression Interactive Designer.
The error you would get was:
"You Need to have the July 06 CTP of the .NET Framework 3.0 run-time components installed before installing Microsoft Expression Interactive Designer."
Turns out you can force the setup to ignore the version checks with the comand:
msiexec /i "July_InteractiveDesigner.msi" SKIPAVALONVERSIONCHECK=1
While On build 5472 i found the menu's didn't work i have not had any issues on Vista build 5520
Of course this isn't supported but since this is a beta anyway i didn't really care!