I have a floppy drive in my computer but that's only because my sister needs it to transfer work to her school. The computers there have no USB ports and no CD/DVD drives. Alternatively you could use ZIP disks at the price of something like £10 per 256MB disks.
Oh yeah and some libraries only allow you to use floppies only.
Myself, I use a 512MB Corsair Flash Drive and when that's being used I also have a digital camera (as a card reader for the xD card inside) and also my 1GB HiMD Music Player. Oh and an external drive (which is slighty bulky - oh well!)