I attended VM World last week, and as you might imagine, it was "cloud computing" this and "cloud computing" that the whole time. The hype factor for the cloud is in overdrive right now. But is it warranted? A lot of people, even tech-oriented ones, outside of the data center sysadmin types, wonder what all the hype is about. I've come to believe that cloud computing is major computing revolution, but for most computing users, it's an invisible one. Geek ambivalence about cloud computing is interesting, because it's not like it's a new phenomenon. In tech years, the idea has been around for ages. But part of the problem is that the actual definition of cloud computing isn't really all that easy to pin down. And marketers have been fond of talking about things being cloud computing when it's really only peripheral, and it's really a shameless ploy to capitalize on a hot trend. But in a nutshell, here's what I think is the essence of the cloud computing concept.

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