Yes, Desinon (spelling is suspect) Icelink works well from what I hear. It allows you to use the steering wheel controls to change songs and playlists and such. Integrates with the radio. It's not cheap but then again, you have a Benz, money should be no object. Heck the audio forum on this site, I think the mod did it.
There is one more way, you could modify the tape deck by snipping the 2 wires to the motor, cutting the circuit board connections to the heads and attaching your aux in wires to that. Put a tape in first before powering off the unit so it knows you have a tape in there. There's instructions with pics somewhere, maybe on my website if I remember.... Of course you won't be able to listen to tapes anymore but I don't even remember what they look like.
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