Thanks for Win2vnc, it's wonderful!
Excellent product. I'm using this with Win7 x64 laptop, connecting to a Mac Pro running OSX 10.5.8. This has made a huge improvement in productivity for me, and just looks better than using 2 keyboards on my desk. Only downside is that cut/paste doesn't work between OS's, and if you leave clipboard sharing on in the options you will have problems. Otherwise - rock solid and takes all of 2 minutes to get running. Recommend also using SSH to secure the traffic to the client device...
Very simple, compatible and flexible cross-platform solution to control more than one computer with just one keyboard and one mouse.