Increasing the number of PWM channels can use a TLC5940. The arduino playground has some code, and an interesting thread. Digi-Key number 296-17732-5-ND, and the 28 PIN DIP is TLC5940NT and everyone is out of stock until Feb 2010 - must be a good chip!
Alternatives - could use multiple arduinos (each providing 6 PWMs) and use I2C to connect or maybe use an Arduino Mega (12 PWM).
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