I love old analog media. I'm holding in my hot little paws a stereo 8-track of a 1973 recording by Hiroshi Itsuki, a Japanese enka singer. It's several times larger than my iPod Touch but contains only 12 songs.
Sadly, this fabu converter from Ion doesn't take anything that ancient, but it will magically change your dusty old cassettes into MP3 files for your iPod or iPhone.
The Tape Dock is similar to Ion's Tape 2 Go but can house an iPod or iPhone on one side and a cassette on the other.