When my 60-some year old mother-in-law asked me what "cloud computing" was, I was suprised. Suddenly, it seemed, a buzz-word that those of us in our IT subculture had been using for a while had gone mainstream. (I remember having the same reaction when I heard a news announcer say someone was wearing "bling".)
Sometimes it's nice, though, to be reminded that terms are not so obvious to people who might not be immersed in technology day and night. I ran across a nice video and article on CNN.com that explains that "cloud" computing is not "light and fluffy", but that data "in the cloud" still sits in brick and mortar server farms somewhere, even if it's not longer on your personal hardware. Whereas this might seem like a no-brainer to us, it's true that the term "cloud" is, well, nebulous, (as nebulous as nebulous clouds!) and people don't really know where their data goes when it's saved.