There's a second alternative: A growing number of New Yorkers are going for duct-free AC systems that involve a small, wall-mounted indoor fan powered by a separate outdoor unit the size of suitcase.

WSJ: Ugliness for All

Unlike the more familiar turbojet, which uses a turbine-powered fan to compress the incoming air before it is mixed with fuel, a ramjet compresses air by forcing it down an ever-narrowing funnel.

ECONOMIST: Jet propulsion

Japanese Apple fan site Macotara is reporting Apple has ordered up a MacBook Air powered by the ARM-based A5 processor Apple designs.

FORBES: Did Apple Put iPad's Brain In MacBook Air's Body?