Moved from MacBook Air/OSX to Ubuntu and super happy about it. The touchpad was tricky though. I had to deactivate the lower 20% (for clicking) and untrain me resting my thumb on the pad.
I rely on it heavily for window management and navigation, and the Linux community is sorely lacking in this department atm.
easystroke-mt - Use mouse and screen multitouch gestures to initiate commands and hotkeys.
touchegg - Multitouch gesture recognizer
Obviously I can't tell how well those work and whether there are better projects...