Just found this amazing tool via infostethics:

Do a search for whatever you’re interested in and see how the results of Google and Yahoo! differ - blue dots indicate results returned by both engines, white dots represent unique results of each engine, respectively. The lines connect equal results.
I wouldn’t have thought that their results are that different.
This got me thinking about switching to Yahoo! - I would get to see the web in a total different order and I am curious about how it’s going to be. And again, I am annoyed by the lack of transparency - what makes Yahoo! so different from Google?

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