http://www.force404.com
These guys wrote a script that redirect 10% of the traffic from a gallery to a full page add. They cheat the reviewers by blacklisting the first 2 ips that see the gallery so they are never part of the 10% even if they come back later to check the gallery. It will just show the normal page for them.
They seem to operate tgps and send a email to their top gallery makers with a username/password to log on their site and try a demo ect...
They are easy to catch tho cause this sheme requiere to only have 1 recip or it could never know when the other 2 reviewers from other tgps (on a 3 recip gallery) will review the page
So keep a eye out for those 1 recip galleries
I'll post the entire log of their front page since i had access to it