Open Source & DIY-IT in Fortune 2000 Companies

Doc Searls has an interesting post over at the IT Garage concerning Open Source and DIY-IT in larger (ie. fortune 2000) companies. From the article:
“An example: a year or so ago I worked as a contractor at a large bank in San Francisco. They have a thousand or more Sun servers doing their web serving: they are running essentially nothing except Apache. I mentioned to one of their IT directors that they could save tons of money by using whitebox servers running Linux and the same Apache code. His response? “Yeah, but then there wouldn't be anyone we could sue.” He was deadly serious: the ablity to pass along some of the risk is far more important than cost or implementation ease.”
As Open Source and DIY-IT continue to gain momentum, these issue will come up more and more and will certainly need to be addressed. So, what is your experience with Open Source and DIY-IT in larger enterprises?
–jeremy