Well, a heavily planted, high light, CO2 injected tank won't cycle the 'normal way'...you'll likely never see a speck of ammonia, so nitrites will never get terribly high.
Plants will use ammonia, and nitrate for food, but not nitrite. Since they soak up most of the ammonia, not much can convert to nitrite.
But in a lower light tank, especially one without lots of CO2 to keep plants going full force, you end up with a normal cycling process.
Rex's homepage has some good info on how to setup a 'high tech' planted tank taht doesn't need traditional cycling.