this looks pretty interesting supersport... i may give something like this a try.
i also found this:
Adding Auxiliary Input to a Car Stereo
which seems like it may/may not work on this kind of player, but if it does, the lack of required equipment would be nice.
edit: ok, so this is almost definitely works, i found a modded one on ebay! http://cgi.ebay.com/ebaymotors/95-02...ht_1703wt_1161
anybody know where i might find a some more info on the circuit board inside the unit? it is delco part#16228082