Just for the information of anyone that is considering bumping their machine up from 1gb to 2gb of RAM, I thought I would share my experience. My 2.16 C2D MBP was running well but I thought I would add another 1gb chip for good measure. The results were astounding! The machine now boots up about 30% faster, iPhoto is running twice as fast, and in general the Hard Disk seems to be working a lot less. It feels like a new machine. If your considering the upgrade, DO IT!