If you're looking for a bag for your 'book, there's a good thread on MacNN Forums.
Compiled by Yakov, the focus of this list is cases that are tailored to fit the Macbook. He includes photos, a mini-review and user comments, and links to manufacturers' web sites.
Fitted MacBook bags are available now from
AppleSac
Bitolithic
Brenthaven
Foof
MacCase
Waterfield Designs
Wrappers
Bags available for pre-order from
Booq
Tom Bihn
Yakov also lists bags 'probably coming soon, or something' and a list of bags that don't fit, even tho' they say they do.
There's also lots of info and feedback from other MacBook owners. Check it out!