I currently have an early 08 Blackbook, but some circumstances presented themselves to possibly upgrade to a MBP (probably 13in) and I am considering doing that. I was told that upgrading the hard drive in my current MB would help me to see some performance upgrades in some media intensive programs I used frequently. While I don't understand how that works, I will be needing more space soon anyway, so I am planning on upgrading. What are some of the best options for a HD upgrade that will working in my MB or a MBP if I upgrade. Specifically, advice about the 5400rpm and 7200rpm differences would be awesome. This is what I am looking at now. Thanks.