I've done these offers before, where you sign up for some service or website with a credit card, then you get some free thing like an mp3 player. I usually have no need for the service, so I call up at the end of the month and cancel it, and that's about all there is to it.
Well here is a deal for a free 30gb video ipod. They have lots of offers, many of which are only a dollar and sometimes they even give you that dollar back if you don't want the service. You should always wait at least a week before cancelling though, to make sure you get credit. Enjoy, let's all watch video podcasts on our shiny new ipods.