What exactly is different? Are the plastics visibly different? I was at an apple store the other day and didn't see any difference between my 2.2ghz MB and the Penryn MB's. Users probably don't notice a difference yet because their MB's are still new. When my 2.2ghz MB first arrived I got few smudges too compared to my original Core Duo BlackBook. Use your new MB's a few weeks and you will notice the same smudges. I'm a bit skeptical and need pics showing the difference in the materials.