Search Engine Relationship Chart (updated)

This page is well worth looking at to give you an idea of where search engine results come from. I wrote an article last year which mentioned this chart (Which are the main search engines?) but the page seems to have been updated using Flash in the interim - it is much more effective. The map indicates whether the results a search engine sends/receives are primary, secondary, directory or paid results. A pdf version can also be found on this site.

Search Engine Relationship Chart