So I'm the (very pleased) owner of a new 15" MBP and 8gb iPod touch. I'm a student in Canada right now, but I will be leaving for graduate school in England come October. I used a desktop throughout my undergrad career, and had multiple hard drives for redundancy. So this is my first laptop, and I am completely paranoid about a HDD crash, and losing my pictures, music, email, work (!), etc. So I want to get an external drive for time machine, but I will need to bring it with me overseas (low weight for luggage, or if I carry it it has to get through security). The MBP has a 200GB HDD, and I just want redundancy from time machine, so I'll need a drive that size. Can anyone recommend something that is suitably portable (and plays well with mac)?