Comparison sites

These seem to be flavour of the month now but from a dev perspective seemingly a nightmare.

I see the following problems

sites need to offer consistent api that doesn’t change often (or will break my search)

I don’t know if there are any scripts out there as a starting point or even iframe’s - I would like to know how possible these things would be to develop.

thanks

I’m not sure what you mean by comparison sites? Do you mean something like BrowserShots or Adobe Browserlab?