My two-year old computer has a 9GB hard-drive, and I only use about 6 GB of it. A 20 GB HD would give me some breathing room, and 100-200GB would let me keep most of my raw (research) data online. But when I'm finished with my thesis, I won't need that data. So I'm curious: what do people do with > 20 GB of HD space? What uses do you find for all that storage capacity? What do you have installed than uses more than even 5 GB?