This is interesting - a netboot feature that works over the wireless network.....

As previously confirmed with Apple, the MacBook Air is the first Mac to support wireless network booting (netboot). This functionality works in conjunction with the "Remote Disc" feature, allowing the MacBook Air to boot from, for instance, Mac OS X Install discs that are inserted in other computers' optical drives. This revolutionary capability was accomplished, firstly, via some major refinements to the system's EFI (Extensible Firmware Interface). Robust wireless support had to be added, especially with regard to using secured WiFi networks.

[From How the MacBook Air's wireless boot feature works - MacFixIt]

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