A couple noteworthy items for future reference:
The battery life of a netbook + its portability were invaluable on this 15 hour flight. I got a lot done and hardly noticed the time.
When renting computers for a classroom in another country, specify English. Our version of XP in the classroom computers was German, and so were the keyboards. We worked through it, but and thankfully the students were good sports about it and mostly thought it as funny.
Also, get to the location a day early or leave a day later. The class will take up all your time, so be sure to play tourist and see some things too.
Third, since most of what we do in CEH is illegal in Germany, even to possess the tools in some cases.......well I am not quite sure what to about that :)