Our good friend Lora Friedenthal sent us a piece of neat info about some other downloading options for your TiVo. Here is what she had to say, followed by the link that will tell you a lot more about it.
You can now sign up to have videos from Unbox download to your tivo. However, if you buy a rental, you have 30 days from the purchase date to watch it AND once you hit play you have to watch it within 24 hours. I guess too much freedom is scary. — Lora
Go to TiVo.com to learn more.