Is there a way to automatically download youtube vids

Does anyone know a way to automatically download youtube videos from your subscription box?

I want to do this because in Australia, we have Internet caps and I want to download my subscription videos at offpeak time.

Does anyone know how to do this?

http://xviservicethief.sourceforge.net/
Has a scheduler built-in. It uses a normal url such as:
h**p://www.youtube.com/watch?v=GiGPNs80v88&feature=topvideos
I'm not sure what a subscription box is.