Linux Kernel - Who Is Developing The Kernel

Interesting little article here summarising another story about the breakdown in % of who develops the Linux Kernel:

• 18% code contributed by volunteers with no corporate affiliation
• 7% unclassified contributors (I’m not sure who this would be?)
• 75% from paid developers

• Red Hat with 12%,
• Intel with 8%
• IBM and Novell with 6% each
• Oracle 3%

I read the figures that large serious development house's want Linux to succeed in all areas of IT and that they are willing to put in serious effort to develop it.