FilmTag is pretty cool and, since MetaX is dead-ware, much needed.
It, however, needs a way to browse artwork if a movie has more than 1 poster... Or how about XBMC-style NFO/artwork export, so videos integrate into both iTunes and XBMC? File Renaming?
(And TV show support, which the dev is apparently working on...)
Crashes or errors maybe 10% of the time on Handbrake-encoded MP4s (for me with the pre-App Store free version, anyway). Code is hosted on Git-Hub, but I haven't had luck building it on 10.7 Lion (I'm not much of a coder...)
Could be a killer app soon. Keep it up Plourde.