Good idea, bad idea

Good idea:
Take your super-sexy, super-light, DVD-driveless laptop on an international trip because it's super-portable and you just want to do some coding or writing from time to time.

Bad idea:
Take said laptop, running the latest Mac OS (which does not seem to be available worldwide yet), into a cell phone shop in the Ukraine and let the cell modem you are buying install a bunch of drivers onto your computer.

In my experience, it just ate the computer.  I couldn't boot, and though I was able to get my hands on my OS re-install disk, (which seemed to be necessary because it had screwed up a bunch of kernel extensions - I was able to determine after about 5 hours of poking at it), I could not re-install because there was not another decent Mac to be found anywhere.  Le sigh.  I basically bricked my MacBook Air until my return to Moscow.  It is back alive, thankfully, but I lost a lot of good writing time...