If you own or use a mac, you may consider purchasing more Mac memory. I have a desktop mac, that I purchased in college about four years ago. This computer is a point I always like to make with people who aren’t keen on macs. In the four years that I’ve had it, I have not reformatted once. When I had a Windows machine *gag* I had to reformat every few months. What a pain in my ass.
I upgraded the memory about a year and a half ago, which was a good decision. I work on an intel mac at work, and honestly, after four years my macintosh runs just as fast.