SeasonPassGetter works well enough. However, it re-downloads the same shows multiple times. If you change any of the meta data (such as specifying the season, episode ID, episode number, artist, etc) about a show within iTunes before deleting it from the TiVo, SeasonPassGetter will immediately begin to download the show again.

So far, I have found one way to delay this response from SPG until the next time to launch it. If you duplicate the video file in the Finder then delete the original, SPG won't notice until you quit and relaunch it. The only attributes you can change on the original video in iTunes are the checkbox in the playlist and the Not New status. As above, changing anything else will trigger a new download. Then, you can drag and drop the copy into iTunes. It will appear under Movies where you can set all of its attributes.

Unfortunately, this workaround defeats half of the functionality of SPG. That said, it is currently the best solution I have found so far without using Windoze.

The developer does acknowledge this behavior on his website. Based upon the 2007 release of 0.14, it appears that he has stopped work on the application.