I was pleasantly enough surprised at the reaction to the initial version of Make Video Tags that I've updated it to include a couple of new features.
This is a no-big-frills video tagging app that I was using in my rip-dvds-for-iPod-with-Handbrake workflow. Added to the new version is the ability to open files in the Finder whereby they will be added to iTunes and then be available for editing in Make Video Tags. Also, if one or more iPods are detected to you can choose to send the tracks to a selected iPod.
This app handles editing of only the few video tags editable in iTunes itself. I highly recommend using the application Lostify, written by Lowell Stewart, for editing a lot more meta-data, including MPAA ratings, network, air dates, cast information, and so on.