Scalable Computing 
The
"Scalable Computing" section of the Digital Systems Knowledge Transfer Network has published an
article, called "Cloud - why now?" by me,
Dave Levy. It is a brief article looking at some of the thoughts I developed over the last year about why organisations are developing new architectural models for IT delivery and how they'll do it. It looks at the computer science, the economics and the way in which scale is self fulfilling. The scale of the problem, of which there are three dimensions, (data, complexity & connectivity) inspires scalable IT, which itself enables the scale of the solution, and enables higher levels of scale.
I think I can do better with more words and may revise the paper at some point. The article has a short URL,
http://is.gd/5MIyy, the KTN is probably best used with a login, although they also have a twitter stream,
http://twitter.com/ScalableComp and while I link to
my linkedin profile in the paragraph above, I can be also be followed at
http://friendfeed.com/davelevy, where you can also comment.