I've had my MacBook Unibody White for about a week now and since the first time I've used it I've noticed occasionally I can't glide my finger over the trackpad smoothly - its just jittery if there's a word to describe it. It depends on the moisture level on my fingers - if my fingers are really dry it glides smoothly but if moist sometimes its jittery. Does anyone else experience this with the new white unibody macbook? I've tried my friends MacBook and its the same so its definitely not just my MacBook in particular in regards to the texture.