Quote from nswien:
You mentioned the harddrive is user replaceable. Is the Ram also ? I just want to make sure that neither of these two changes will void the warrenty. Although I know that Apple will no longer warrenty either of the replaced parts.
Yes. My wife's MP13" arrived 2 days ago and I upgraded from 2 GB to 4 GB. Its very easy. You need a jewelers/eyeglass type Phillips screwdriver (very small tip) to remove the back cover screws. Just keep remember to keep the 10 screws in the same order as the hole they came out of because they are different lengths. The manual that comes with the notebook explains how to do it.