Since there were a few requests on a HOW-TO using ThumbGen to get info for TV Shows I made this tutorial that you can download HERE. (UPDATED 1/26/11)
The tutorial is in PDF form wo you will need Adobe reader to see it.
Also, the turtorial may seem like a lot to do, but once you have everything set up & get fimiliar with how to operate Thumbgen it is really quite fast. I can usually do a whole TV show season and make all the changes in about 15 min.
UPDATE: I have just updated the turtorial to include corrections and things that were left out of the orginal. This tutorial also now contains info on how to add backdrops & how to resize the thumbnails to the correct size using GIMP.
Again if anyone finds mistakes or things do not work as described, please let me know and I will try to make corrections.