this is what i use.
http://www.buy.com/prod/kingston-4gb...207937969.html
its on sale now too, and at a great price.
4 gigs for $22 shipped.
i keep it on my key chain so its always with me.
the only bad thing is to you have to remember to take your keys with you when you leave.
it's happened to me before but thank god i use it for work. it would be a different story if perhaps you left it in a school library.