For a look at how one IT leader did it, with no glitches, see this CIO.com article:
Virtualization at Warp Speed: How One Company Made it Fly
Want to virtualize 95 percent of your production servers within a year? Vincent Biddlecombe did. Here's how the CTO of logistics company Transplace went from having no virtualization expertise in house to running the company's mission-critical app on a VMware environment.
http://www.cio.com/article/164600
