If you don't have a TV, you might try some of the Spinerval audio CDs. They're less expensive, and you can use a portable CD player, or load them on your iPod.

I only have one of these, but I really like it. It is a pyramid of high cadence intervals, and goes for 45 minutes. But, I can also use the interval cues to do high resistance muscle tension intervals, too. Or, you could use the intervals to do standing/sitting intervals, whatever.

I think it helps to get in a good structured 90 minute workout on the trainer, and you don't need a TV.