There was a flurry of discussion about the MacBookAir.com redirecting to:
http://www.apple.com/?Will+We+see+a+MacBookAir+on+Tuesday
This redirection is not an endorsement by Apple itself. Anyone can redirect any domain (they have control of) to any other domain and add a "query string" (?text). You can change it to whatever you want, and this query is passed to the web server. In this case, Apple.com ignores the query.
Example: http://www.apple.com/?I+love+you
And besides, MacBookAir.com isn't registered by Apple... it was registered by us. If Apple decides to use the MacBook Air name, they are welcome to the domain.