Guys,
Just an FYI in case you don't know this is possible...Tivo to Bold!
With Tivo and Tivo desktop software "plus" (about $20 upgrade on the free Tivo desktop software), you can auto download shows you record on Tivo to your PC and you have the option to auto convert to several formats.(Note: Tivo must be on a home network and running off a cable/tv setup, I don't believe Tivo desktop works with Satellite Tivo Systems.)
I have mine converting the downloaded files to H.264 compatible format. You can then have all the videos your heart desires or those you can record off of TV/movie channels, etc...
I've been doing this for my Ipod and have many, many gigs of tv shows and movies. This is a fantastic program, simple to use and will give you an endless supply of shows.
Another great feature of the Tivo Desktop program. You can Auto Transfer (lets say Mythbusters) and every time your Tivo records a Mythbuster show your PC will download and convert automatically. Its like having a mini video producing company working on your behalf. Sweet
File Size estimates: An hour long show converted to .mp4 will run about 356MB.
4GB card will give you about 10-11 hours of video.. Not bad
BTW, just took a nice drive with the kids and had several of their shows on my Bold and had to fight with them to get it back.. Hmmm. maybe this wasn't such a good idea to share with the family...