from time to time I switch between 3 different versions of vvvv and when I do that I usually have each of them tied to the task bar, then I can quickly access the most recently accessed patches.
it is however a bit difficult to keep track of which is which, so I would like to suggest that the taskbar icons had a little text, like beta33.7 x64 in it somehow so it was possible to distinguish between the different versions.