You could add another GB of RAM too, for a total of 3Gb of usable RAM. (You could add 4Gb, but you'll only be picking up an extra like 256MB, even though RAM is cheap these days, I don't think I'd waste my time with it.
1GB stick + 2Gb stick for a total of 3Gb
So you'll have to purchase a 2Gb stick of RAM; you could probably sell the 1Gb stick you replace it with or keep it for a spare.
I will also note that I have the 160GB 5400RPM drive and it loads faster than the 60GB 5400 RPM drive that replaced it, and some people even claim that it runs as fast as a 100GB 7200RPM drive in almost all cases, except data seeking. Due to disk density.