Eh..? I think you misunderstood me, Connor. I'm not talking about having more loose algorithms for similar image detection that would dramatically increase the amount of irrelevant results. That would indeed be a very bad idea. What I am interested in are the algorithms on how exactly tineye is doing it and I think I have some educated guesses on that (histogram matching and wavelet analysis used simultaneously, for example). That sort of functionality would be very useful for searching pictures locally on one's own hard drive. After all, porn collections tend to get pretty large nowadays..
By the way, Gazopa has been shut down. Good riddance.
Edit: FreeiOnes buyout of tineye would be awesome.
I read something on Gazopa that it was brought down temporarily, so they could redefine their focus. Whatever that's supposed to mean.