I can't start off I'm afraid, as I'm still waiting for my Macbook to arrive ... but would love to see what kind of cases people have got going on out there!
EDIT: Is there any easy way to stop Photo Booth from mirroring the image? It's driving me crazy.
Crumpler Dreadful Embarrassment bag
I have the CaseLogic Shuttle case, that I put in another bag, or just carry under my arm. It is a great case for what it is worth, especially the fact it has a pocket in the front for things such as the power brick.
Finally a case with a spot for the power adapter
who would have thought out of the millions of cases someone would have finally got it right?