Okay, I have to be honest. This is not my tip, I borrowed it from Zulu, who posted it in chit chat.
This is the single greatest thing to ever happen to bike training.
This guy creates these 1-2 hour mixes of music with the same bpm. So, you can use it to work on your cadence when you run or bike. Just pick whichever bpm you need.
I don't have an ipod so I stream it through my laptop (which works great for the bike trainer but I don't recommend it for jogging).
The music has made the bike trainer way less mindnumbing for me.
http://www.djsteveboy.com/mixes.html
ps. it's free. I forgot that part.