So I just added a second hard drive to my computer and am using it as the primary drive. Finally I feel like I can breath again! I've been relying on the same old 20 gig hard drive for 5 years now, and things have gotten so bad I've been hovering at around 90% disk full for a couple of years now. I couldn't even defrag because of the lack of space.
Now my primary drive is 80 gig. Everything just runs much more smoothly now, and all it cost was $50! It almost feels like getting a new computer in terms of improvement in speed and freedom to do things like save a large file lol. Second best investment for an aging computer next to RAM.