To add to Brian's point about 64-bit support, in the F5 scenario, our collection mechanism (i.e. how we collect information about a process) is specific to 32-bit processes. Unfortunately, we didn't have enough time to implement 64-bit support and had to
make a hard cut. You can bet that 64-bit support is one of our top priorities after the VS2010 release.
We are working towards having a solution where you don't need VS installed to be able to collect a log file for the Historical Debugger. We haven't finalized a plan yet, so I can't go into detail about what the final experience will be.