Interesting. I went to the Apple Store to custom configure a new MacBook Pro now that they’ve gotten speed bumps, and include Firewire 800, and I saw this on the options that you can add-on:

A MagSafe Airline Power Adapter.
Looks like Apple’s building one now (finally) and they’re selling them as add-ons through their online store, but you can’t buy them individually yet.
Interesting though. Now, I’m wondering if all four of the stupid iGo power adapters I own will ever be useful again, or if I spent $600 on those things and will never use them again… figures. Apple and their damn proprietary parts.
I’m also curious: Is it “MagSafe” or “Magsafe”? You can see in the image above, Apple isn’t sure, either.
update: Looks like you can buy it online at the Apple Store. Found the link at TUAW.