This is wicked cool technology. Andrew Grumet, the guy that developed the RSS module for his TiVo has continued hacking away and come up with a pretty sophisticated recommendation system for it.
Check out the app here: Program My TiVo!
You put in a title, it searches TV listings and then lets you leave info on who you are and why you suggested it. It's a pretty cool use of technology and a great example of clever hacking.