Are 'private clouds' evil? Or just vendor hype?

InfoWorld
There has been a great deal of back in forth in the blogosphere around the use of private clouds, which generally means IT infrastructure that relies on the same techniques cloud providers use for their own datacenters, such as multitenancy, virtualization, Web delivery, and highly standardized environments. Most of the discussion emerged from a blog post by Appirio, "2009 prediction: Rise and fall of the private cloud."