Fourteen businesses rank higher than Google in the most recent (2.6.31) report; most or all of them are Linux distributors or hardware vendors. (Note: I'm not counting none, unknown, academia, consultant, or the Linux Foundation as businesses.)
Compare this to other web companies like Amazon, Yahoo, and Facebook. They use Linux just the same way Google does, but they sponsored zero lines of code identified in this report. [Greg K-H gently chastised Amazon about this when he did a tech-talk there on Linux development.]
As for Yahoo, it runs on FreeBSD, actually. They provide hosting to the FreeBSD project, though I don't know if they write any code.
Note that Amazon also distributes a custom embedded Linux system on the Kindle.
Replace Yahoo (oops!) with some other web site operator. It doesn't matter which, since not one of them contributes as much as Google. :)
"Since its inception in 2005, the program has brought together nearly 2500 successful student participants and 2500 mentors from 98 countries worldwide"
What about http://code.google.com for free project hosting?
What about "Google has released well over a million lines of code and over 100 projects"? (from http://code.google.com/opensource/)
What about Chrome, Android and Andrew Morton?
Good PR move to hire Andrew, but those 5 submitted changesets he didn't author is a pretty meager upstream output of Google's rather large kernel team.