I ordered an external eSATA disk caddy today.  I’m going to try run the W2008 R2 Hyper-V image from that instead of swapping internal drives in my new laptop.  I’ve no idea if it’ll work or not.  Even if it doesn’t I can buy a drive to put in the caddy to store VM’s.  Why eSATA?  Because it runs a lot faster than USB 2.0.