It appears the white Macbook, the original and longest surviving holdover Apple laptop, was retired.
When you type in the URL "http://www.apple.com/macbook", it just takes you directly to the Mac page with the picture of the Air. I think some explanation will be forthcoming.
And it does say quite a bit about the future of Macbooks. If the Air is suppose to be the heir of the Macbook, it looks like Apple could be looking to slim down all the rest in future updates.