If you have a TV Tuner card in your PC and use Windows Media Center for recording TV shows, you might take a look at a freeware product called ZuneTVWatcher. The description of this product is as follows:
ZuneTvWatcher is a program that will watch your Recorded Tv folder in Media Center for any changes. When a new show is recorded, ZuneTvWatcher will automatically convert your recorded TV show into a format that the Zune supports natively. In addition, when a TV show is deleted within Media Center, ZuneTvWatcher will also delete the converted WMV. When you combine this with Automatic Syncing of your Zune, either by full library sync or custom sync, everytime you sync your Zune, your recorded TV shows will be automatically synced, and your Recorded Tv shows on Media Center and your Zune will stay synced together.
I don’t have a TV Tuner card, so I can’t use this application as of yet, but it does sound like a very useful product. This developer also provides a meta data tag editor (very similar to dSharpie). Unfortunately, this application will only convert DVR-MS files (which are created by Windows Media Center), so you can’t use it for converting any other video formats.