a tale of a virtual machine (Score 1)

I work as a unix/vmware consultant for a company in the midwest where every client wants to give me an XP notebook with their special-sauce VPN software installed. I accept the laptop and immediately P2V it using VMware's Converter, then import the VMDK files into Parallels and run the clients system on my MacBook. Lately I've been eyeing an iMac... and you guessed it, how can I run the client's VM on the iMac in the morning at home, and then run to a cafe in the afternoon with my MacBook? The only thing I can think of is bastardizing a DR tool such as DoubleTake. Has anyone tried this? How well does it work?