The flash drives come in quite large sizes these days - should have plenty of room for documents. Even if you're doing multimedia work, I think there'd still be sufficient space. I have a 1GB one that I use for backing up essential files at work - copy them to the drive and transfer them to CD at home. I shouldn't really be doing it, but nothing confidential or commercially sensitive is stored, so sssssssh
I'd be lost without all the useful URLs, PDFs, and notes that I have stored.