i made the chaser chip myself, well i was searching the net for flashing LED's and found a code for the pic12f683 (which i have som of from RFmods)
the code i found was for a five pointed star (xmas decoration) which was designed for 20 charliplexed Led's to be wired to. and a button to turn it on and off
i played around with this a bit and found with the five outputs you could make som cool patterns then ended up putting it in a pad im only wired to 2 of the outputs for the leds for this to give the chaser effect. also used colored LEDS for this as the white ones just wernt bright enough through the chip.
and as for mike selling his chaser chip yeah i think you should sell both kit and chip form kits for peolple who dont av lit buttons mods already and chip's for people like me who have lit buttons in all of there pads.
i also found som other chaser codes for the 16somthing chip but i dont av any of these to test on at the mo so may be placing a order of them somwhere to test that chaser out on as it has more functions and LEDS