Originally Posted by Paz

This is a fair point but the same could be said of the linking pattern algo that would mean that high ranking sites get found more easily and are therefore more likely to acquire links. I don't know I'm thinking aloud but I've often wondered if a site that gets more serps clicks would score more points somehow. Another possibility would be to demote sites that rank highly in specific searches but never get clicked on; ie are (somehow) completely irrelevant to that search.

The search engines are certainly monitoring organic clickthroughs. If you look at the AOL data that was accidently published recently, they are not only monitoring clicks but also storing rankings of the sites that do get clicked on.

If the SEs did use clickthroughs, or even lack of clickthroughs in their algo, it's even more essential that you write an attractive title and description.

Cheers,
Paz.