Old timers around here will remember me theorizing for years about something called "People Rank", where the actions of real people influence the search engine rankings.

Here's a new search engine that heavily relies on "People Rank":
http://www.scour.com/

It isn't as covert as many other People Rank concepts...Here it applies a strategy similar to Digg to help rank sites. You vote up/down and can add comments for each site.