I like Google documents (g-docs). The fact that I no longer need a flash drive or anything to worry about brings me peace of mind. How many times has this happened to you: You come to school prepared with a great lesson plan saved on your 8 gig (512kb?) flash drive. You stayed up for hours creating this one unit and then when it comes time to present your flash drive isn't working and you have to improvise.
The fact of the matter is that travel/flash/memory sticks will be obsolete in no time. Why you ask? Because with the advent of cloud computing coupled with powerful productivity applications like Wunderlist, Dropbox, Evernote, and beyond a person will almost always be prepared and ready to launch their lessons wherever a computer or smart phone is located- without removing anything from their pockets or around their necks.