What setup do you recommend to protect data on a MacBook in the event of theft/loss of the device?
I'm specifically interested in Macs here, rather than laptops generally, and in concrete recommendations rather than what's theoretically possible. In particular the new MBAs, as these don't seem to have a way to physically lock the device to anything.
I'm interested in addressing attacks that a reasonably sophisticated attacker who was interested in obtaining the data on the device, rather than the device itself, might attempt (e.g. booting an alternate OS from a USB key, trying to put the Mac into target disk mode, physically removing the drive, etc.)