I've verified that the typical dock connector will NOT work with the Ipod Touch gen 2 or likely the newest iphone. This includes the EAS connector listed earlier in this thread - it doesn't work.

There is some kind of additional resistor required to make the newer devices work. I ended up finding a product that does work - it's called PocketDock and you can get it from SendStation. Works fine with my Ipod Touch 2g and my aux input.