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I saw this video and was curious if anyone knew how this person did it. I've seen these radios apart and my mind is boggled on how you could do this. Anyone have any ideas? I understand the outboard ones people have done, but I'm floored over this internal one.

http://www.youtube.com/watch?v=PJHh1tLnFH0
 

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Could be a number of things. It looks to me like it might be an internal FM transmitter connected to the jack, because he left the radio on 95.1, the radio would work normally when there was no in to the tx. I vaugley recall an article metioning daisy-chaining on to the external amp plug on the infinity deck as well.
 

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I looked into this several years ago and decided the modification was way outside my scope of understanding. I found a shop who would do the mod for me for the same price as a new stereo.

Then I went and bought anew stereo with a stereo mini plug jack on the front of it.

That stereo got used for many years before failing and I just replaced it again with another for under 80$, and the sound is impressive, and the extra features, like usb port, are nice.

Sony CDXGT56UI
 

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Many things depend on what radio you are doing this to. Older radios may be easier to convert than newer radios.
Some antique radio collectors upgrade their tabletop receivers for use with an FM converter, CD player or iPod-type device. Many home radios had the benefit of a radio/phono switch in the back with an input jack for connecting it. You want to place a switchable jack in front of the audio stages, usually at the center lug of the volume control on the old 3/4 of a turn controls. Newer volume controls that can keep turning are actually switches (rotary encoders) and the audio input can't be tied to this point.
Some premium Chrysler (and other) car radios have DIN jacks already in the rear for auxillary CD changers, etc, but any low-level audio component input should work.
Cassette players could use a 'dummy' cassette that dropped in and you could play your Discman (or whatever) through your car speakers.
Mopar CD changers had an inline antenna 'modulator' that would inject the audio as an FM signal to play through the car speakers. This method can be used on all radios that have FM. Other than power to the modulator, no special wiring or taking things apart is necessary. There are a couple of selectable FM frequencies on the modulator switch, you just select one that has no station transmitting on it in your area.
 
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