If you have a TiVo Series 3, a TiVo HD, or HD XL, you'll be able to add feeds or season passes for hundreds of new web videos, shows, and podcasts.
The custom feeds are especially helpful since TiVo's search listings don't always pull up what you're looking for. Having it directly fed in and downloaded makes things way easier.
Want to see it in action? Check out TiVo's website.