Search Engine Relationship Chart (histogram)

Every search marketer that respects himself has this chart bookmarked. Produced by a well known SEO firm, Bruce Clay, this is a historic diagram (histogram) of the relations between different search engines.

What this diagram shows is the search results feeds running from one engine to power another. For example, you can learn that for April 2006, yahoo's ads where syndicated on MSN (microsoft's search engine). For January 2007, this relationship ended.

January 2007 is the last point on the time axis. I wonder if they stopped updating it, or there weren't any big changes in the search world to care about during the past year an a half... There's this new deal between google and yahoo cooking up (google try to tap into yahoo's network). If this one closes, I think it will be worth an update.