It appears that there was a flurry of cloud stuff yesterday and today!
Google’s note on Cloud computing:
http://googleenterprise.blogspot.com/2009/04/what-we-talk-about-when-we-talk-about.html
ZDNet comments on ‘private clouds’:
http://blogs.zdnet.com/microsoft/?p=2610
These are interesting as the real benefit to this concept is that there is a consistent API that would allow applications running in a private cloud to be moved to a public cloud. Without this I don’t see how private clouds will really survive as a long term concept. Basically will the commercial cloud players try and make a stab at a uniform interface (or collection of interfaces)? If that happens the private cloud concept will live and prosper, otherwise it will take a couple of years to shake out the players until there is a defacto set of standards.
Finally The register has:
http://www.theregister.co.uk/2009/04/29/eucalyptus_goes_commerical/
This is where a newly born company (out of academia) is duplicating the Amazon Web Services (AWS) and enabling the private cloud concept. Pretty humorous amount of activity yesterday
Things are definitely hotting up under the clouds 
Gareth