Me too, except with Linux on one and Windows on the other. synergy works fine, although the fact that the last release seems to be from 2006 worries me a bit.
I keep meaning to pick up the synergy source code and improve it a bit. Things I'd like to see:
* Make it peer to peer instead of client/server, keyboard & mouse events from all peers are shared, not just the server's
* Use mDNS (e.g. Bonjour) to auto-detect nearby peers and auto-connect to known ones. Also, use some kind of authentication - you don't want random people on a public wifi to be able to get access to your clipboard because you forgot to quit your synergy client.
Alas, I haven't had the time. Maybe this summer...
I'd love to shuffle around my project priorities in return for sponsorship. :) I've emailed you at m@..., my email address is in my HN profile in case it gets filtered or whatever.