I got the Cruzer mini 1 gb for my school work. I was required to do a lot of file sharing from computer to computer and work from several different stations.
1 gb was plenty enough space for what I needed it for. It came with a neck strap, so it was convinient to just throw on and carry around without always worrying about where you left it lay last or losing it. It's little and very light weight so it's no bulk or extra load.
I have very important projects and files that needed to go on the disk and were being completely trusted to the jump drive, and I can say that not a single file ever was lost or corupted through using it. This is an even more impressive stat when I say that I used it at least once a day for two years. Now I don't have as much use for it, but I know it a dependible one if necesary.