well, i'm not sure it has to be three switches. like i said, i could wire the cans in a series and use one switch to control them all. they would then brighten and dim together, all at once. obvioulsy, that's a no-brainer.
or, i could use three seperate dimmers and wire each pair of cans to one of the three dimmer switches, but then i'd have to turn all three down to get the room dark ad vice versa (though this arrangement would be the most flexible re: lighting schemes).
however, what i'm hoping to do is set it up so that when i turn the dimmer down from the switch (just one master switch), the last set of cans dim to nothing (depending on how much i turn the knob of course) then once they are off, the next pair of cans begin to dim and so on until all three sets are of. the reverse is true when brightening the lights, the first set goes up, then the second and the third.
i understand this is a bit out of the ordinary, but i was curious as to how difficult it would be and if any companies make a switch or controller board that accomplishes this function. obvioulsy the cheaper the better, and i'm not looking to automate the entire house or even remote control it.
i've also posted this question in the Bob Vila's fixit for'em in case you're interested in followig along there too.