I'm one of those people that has a USB key. I have two, actually, one is 128 MB, and the other is 1 GB. I discovered something disconcerting recently, and that is that every single document I have ever created in the whole course of my life could fit neatly onto one USB key (perhaps the larger one). Those things are tiny! It was a very humbling experience to see how, practically, all of our life is but dust, and not very much of that.