ComputerWorld is running this really interesting article written by Carol Sliwa focusing on high volume businesses and their contemplation of running Linux servers. "Now that Linux is more commonly viewed as a mainstream option for mission-critical functions, IT managers are increasingly evaluating the open-source operating system with the same due diligence with which they compare commercial offerings."
"It's not a science project anymore," says Julie Giera, an analyst at Forrester Research Inc. "At this point, Linux shouldn't be different than any other commercial software package you buy. The rules should be the same. The level of scrutiny should be the same, and the process for approval should be the same."
The article continues with explanations of criteria and analysis of their testing. Comparisons include IBM Linux servers vs. Sun Sparcs running Solaris. Read the full story  to find out which performed better.