When I first saw the title of this article over at Ars I rolled my eyes: Cloud Computing: a short introduction
Then I read it.
It turns out to be an incredibly thorough, yet brief, technical description of the term Cloud Computing. The article does a great job of defining Grid Computing and then uses that definition as point of comparison to arrive at a very real and very useful definition of The Cloud. I'll be a little less embarrassed to use the term after reading it. Only a little. But still...
Well worth a read for anyone who needs some clarity on the whole Cloud thing.