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Stingc took the words out of my mouth. Its called "Hemoltz Resonance Theory". Its an interesting phenomena and can be used to squeeze a couple extra horespower out of engines.
As far as variable intake goes there are several varieties. The two runner design is common on some older cars as well as multiple plenum volumes. GM has done that on some 6 cylinders where there is a butterfly valve connecting 2 different plenums. At a certain rpm the valve opens and connects the plenums making a differnt volume. BMW has a continuosly variable intake that works on an interesting concept, but is a bitch to explain.
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