Vista and OSX holding hands?

I got my second box setup for running 3 instances of wow, its a Vista
box with a tun of ram, video cardage and all the other goodies needed.
So here's the plan:

Mac---> Tank--->Healer
Vista--->DPS/CC x3

Control both boxes with the Mac keyboard and tuns of macros.(the macros are the easy part)

Now for my question. Has anyone used a Kvm device to run both OS's at the
same time? Im thinking a hardware option might work best, but i just
dont know for sure. Anyone have a suggestion?

I've looked at both the Y-Mouse and this guy:http://www.bestbuy.com/site/olspage....=1067390694346
But i think maybe the IOgear version only lets you control one box at a time.

Anyone have experience trying the old Vista and Mac handshake while boxing?

I wasn't sure where to post this, if it should be in the hardware section please let me know.

DB