Alex at TiVo Blog has written up a nice guide on how to watch nearly any video podcast on your TiVo, given a Windows PC, TiVo Desktop Plus, and iTunes.

He's also posted a video of the process:

Click to view

According to the official TiVo Blog, the launch of the Rocketboom downloads has been delayed:
Update: Thanks for all your enthusiasm around the Rocketboom launch-we know that many of you have been looking forward to your first download today! Unfortunately, it looks like we've hit a couple of bumps in the road on Rocketboom trial and won't be able ( Read more... )

TiVo will begin providing daily downloads of the Rocketboom video podcast to users of broadband connected Series2 TiVo systems. It will show up as a Showcase on the system where you can sign up, or you can sign up via this web page. That page also has more information on the offer.

Even better is this:
The TiVo Videoblog Project is currently ( Read more... )

MP3 Podcast - the TiVoShanan interview is near the end.