Google: We Suck At SEO. Badly.
businessinsider.com
businessinsider.com
For the same search, Yahoo places itself as #1 and Google #2.
Bing's takes the old school award: #1 is Dogpile, #5 is Altavista. None of the big boys from today are in the top ten, not even Bing themselves. I like that, its like they've got a small ego.
Google is the one company in the world for which SEO doesn't matter, because they can change the rules at any time. A query for "google finance" that doesn't bring up google.com/finance as the first hit will be recognized by all internal search engineers as broken, and relative weights of signals (and hence rankings) will be changed accordingly. A little uptweak on organic SEO plus a little downtweak on premeditated SEO and voila.
This isn't even wrong, it's just the way it is.