I've had my white, C2D MacBook for around 3 months of light usage. Recently, the usage has ramped up quite considerably. Almost immediately after this increase in usage, a hint of yellowing became visible on the left-hand wrist-rest, sadly I did not purchase protective covers until it was too late. The yellowing has accelerated and is very noicable now. It is also occuring, albeit to a lesser degree, on the right-hand wrist-rest Is this covered by my AppleCare extended (3-year) warranty? How long should it take from shipment to receive it repaired? Anyone else seeing this on their new MBs?