I'm currently in the process of developing an external TGP watchdog to allow owners to have all galleries on their TGP monitored for cheaters and bad galleries (from 404s to dialer downloads, foreign/local redirects). I'm even considering adding in image checksum monitoring as well so if the images are changed at all it will be picked up on.
The goal is to offer a product that allows webmasters to have their TGPs watched without needing to rely on their TGP script (or worse if their script doesn't have any true cheat protection).
In any case it's free during development time and I encourage all TGP owners to try it out....I'm a feedback whore and can use all the suggestions and advice I can get.
http://www.tgpwatcher.com/