What do people think about the air of secrecy around Google's technology?
On the one hand, it's a private company that has no obligation to publicise what it sees as trade secrets. Also, publicising algorithms may help SEO "cheaters" to climb the rankings.
On the other hand, Google is now immensely powerful, unregulated and has a profound effect on peoples' livelihoods. The spirit of openness has not hurt software such as Linux (though I am not suggesting Google should go open source), and it is this spirit which founded the world wide web.
Are Google's algorithms so weak that their site would fall apart if they let people know more? Should they not give something back by opening up a little to the searchers who trust them so implicitly?