For those of us who like to play around with virtual machines and find ourselves unable to to load a guest 64-bit OS without the wonderful Hyper-V or some other costly solution, there is HOPE!
I stumbled across VirtualBox, a FREE VM environment that allows you to run a x64 guest OS on any host OS. Check it out here: http://www.virtualbox.org
I am currently running one at home on my Windows 7 box :)
Note: I only recommend this for those who like to dabble on their machines at home as I have no idea how it would it perform in a production environment. What I have noticed is high (but no too high) CPU utilization on the host machine.