I have many boxes of tapes and wanted to do the same thing. At first, I simply put a tape in a tape player and ran the line-in recording wire from the headphone out of the tape player to the line-in of my IRiver MP3. It will capture the stream as a MP3. A better solution for me (since I have so many tapes) was that I found a vendor online that sold a internal audio tape deck. I works just like a cd or dvd player. Pop the tape, choose how you want to save it and click the Play button. It's called PlusDeck and you can find it on ThinkGeek.com.