Everyone is constantly talking about what will be the next “Google Killer”. New search engines appear and older competitors are trying new ways to be more effective in locating and displaying what you are looking for.
Recently Microsoft has begun trying a new search theory called BrowseRank which relies more on human visitor elements by measuring and ranking how the visitor actually uses the site. Things like how long they stay and much more. This sounds like a good idea, although many people already don’t trust MicroSoft and there will be privacy concerns raised.
What I think about whether you should be concerned about this new algorithm is that you should learn about it, but not worry about it. By making a site that your human visitors can easily use and enjoy is always going to be the best method of making it more popular no matter which search engine or ranking method are used. I have written before about designing for your human visitors and that advice is still what I believe.