Who needs internal SEO? Yes, this time it is Yahoo turns to go behind an internal optimized engine and give an automatic link to any highly search terms included in their content.

Concentration on Google.com and Yahoo.com including sub domains and excluding other domains.

Google Site size: 6,890,000
Yahoo Site size: 131,000,000

Inlinks 1 - 10 of about 3,219,523 toonly this page yahoo.com
Inlinks from all pages 506,562,439 to the entire site
Inlinks (297,533,145) except from yahoo.com to the entire site including yahoo.ca yahoo.jp yahoo.fr yahoo.de and local yahoo portals

Here is one proof where Yahoo gots the first hit for ryan air ben laden on Google.com
http://fr.news.yahoo.com/20062007/202/11-septembre-ben-laden-pourrait-avoir-loue-un-avion-pour.html

Look how spammy the article gets when Yahoo internal automatic engine begins to work.

I think Yahoo is already getting more than half of its traffic from Google search results after May 2007.
That’s good when a company like Yahoo knows how to use their internal resources.

Microsoft launched IE 7 then asked both  Yahoo and Google to promote it.

The Reality is that neither Yahoo nor Google noticed that Microsoft has sent them a standard format of webpages, content and images.

Yahoo promoting IE 7 - Google newly updated promoting IE7
Yahoo & Google ended up using same webpage to promote IE 7 ( latest Internet explorer )

Google upgraded their IE 7 ads page and Matt Cutts apologizes for that misunderstanding or misleading tactics by Microsoft. 
Image by Google Blogoscoped