Virtualisation on Windows 7 64 Bit?

As you may have guessed, I'm currently running Windows 7 Enterprise 64-bit on my new laptop. All is going well, but I have encountered an issue!!

I have a number of Virtual PC guests which use the old version of Virtual PC. I have obviously install Virtual PC RC, in order to achieve the XP Mode, which allows me to use IAG within the 64 bit environment.

My older Virtual PC files don't work in Virtual PC RC!!

So sensing a time for change and to purge the elements I don't use, I recreated the Virtual PC sessions on VPC RC. It's at this point, I think I should try out UAG in a demo environment, but as I have to use Windows 2008 R2 Beta, I discover that Virtual PC doesn't support a 64 bit environment and I seem to get jerky guest sessions unless I allocate a lot of memory and install the integration software, so what are my alternatives:

I have used VMWare Server in the past, and although the software supports 64 bit clients, but the amount of services the software uses up, makes me investigate how to stop these services when I don't use VMWare. I end up switching all the VMWare services to Manual, and then create a batch file to initiate them.

After much snooping and Googling, I discover Sun VirtualBox

I find that it is very easy to use, it will support 64 bit clients (which seems to be better tab) and it is effiecient with its resources (unlike VMWare)

Sun VirtualBox is now my main client for any virtualised environment!! (and best of all, it's free!!)