Geoff has a great post on making use of the Lyrics information, which iTunes lets you attach to any audio file in your library. Once you sync your iPod with your iTunes library, whatever you put in the Lyrics information tab will be available on your iPod.
As he says, while it’s meant for lyrics, it’s really just a text field, so you can put anything in it – Assimil dialogues, troublesome vocabulary, or transcripts of whatever you’re listening to. I’ve had an iPod of some sort for years now, and I never thought of doing this, even after seeing some podcasts come packaged this way, like Slow German. All this time, I’ve been printing out copies of the transcripts for Deutsche Welle’s Top Thema podcasts, when I could have just been copying and pasting the text into the Lyrics field.