There is an article on SearchEnterpriseLinux.com, "Maturity Makes Linux Less of a Gamble for the enterprise" that says that Linux continues to grow in the enterprise and says 2.6 "promises more enterprise features that will drive adoption deeper into the data center as well" :
"More enterprises have been less reticent to gamble on Linux during the last 18 months. Once solely a perimeter infrastructure play, Linux is now finding its way onto mission-critical database transaction servers, high-performance computing clusters and even the desktop. . . .
The article tells an interesting tale about the effect the SCO Group's threats had in Canada. Daniel St. Gelais, a consultant with Quebec City, Canada's InfoTech, tells how he recently delivered a Linux-on-the-desktop presentation to the local government there, but they were afraid to migrate. That was at first. However, there is more to the story:
"Recently, however, things reversed course again for the Quebec government, St. Gelais said, once it saw that IBM and Red Hat Inc. were countersuing. 'They are open and ready to be part of a pilot to use open-source software, especially Linux,' said St. Gelais. 'I advise anyone not to be afraid to make a Linux proposal to their decision makers.'
"Many high-profile enterprises, meanwhile, are grounded in Linux. Online travel agent Orbitz recently moved off of Sun's Unix OS, Solaris, to Red Hat Linux at a 10x cost reduction and a 2x performance boost, said chief Internet architect Leon Chism. Others like Lithonia Lighting, a $1.3 billion lighting manufacturer, and Dallas Airmotive, a Texas-based airplane engine manufacturer, each saved more than $500,000 doing Unix-to-Linux migrations."
Scalability is the selling point, the article points out, in addition to money saved. A Lithonia spokesman is quoted saying he "spent $250,000 on hardware for the production rack, and he estimates he would have spent three times that amount on a Unix environment. 'We got the stability we needed and by buying Intel servers, you can add on the fly. That's the beauty of clustering -- that, and the redundancy,' he said."
Meanwhile, the SCO suit is driving adoption of Linux in Australasia, according to Red Hat in this ZDNET article, because people ask questions and then Red Hat gets to explain, which seems to resolve any worries.
And finally, someone sent me this link to David Stutz' "The Failure of Shrinkwrap Software," which explains to the old-fashioned what is wrong with selling software as if it were a product like shampoo.