I have an Ubuntu 11.10 laptop paired with an Apple Wireless Keyboard. I'm using the answer on this question to swap the Command and Option keys so that they are mapped like a regular keyboard. This works fine in Ubuntu.
Now I have a Macbook Pro running as a Synergy Client. This mapping kind of works on the Macbook, but it only allows me to Command+Tab between two programs, not all of them. Copy, Paste, and other Command keys seem to work fine, but not Command+Tab. It's annoying just because I use the keyboard a lot.
And yes, I could switch to syncing the keyboard and the Macbook, but I use the Ubuntu laptop more.