The higher up the food chain, the more concise you want to be and your article feels verbose to me. The line:
"Since I'm a big proponent of public clouds, my definition also includes the use of virtualization, but yours doesn't have to."
is a prime example of being verbose and has the added consequence of detracting the reader from your actual point.
Also, you say you'll cover the technologies more in depth in later columns so why bother beginning to go into depth about NoSQL now? More fat you can trim.
If I'm not mistaken the the point of this article is two pronged. First to introduce them to the idea that Big Deal is a set of tools and techniques. Second to get them to appreciate the fact that "This data screams to be mined for valuable insights." You introduced and developed the first idea enough but it feels like you only brushed over the 2nd idea. The google example was good, you just need to drive home the idea of valuable insight from large sets of data in as close to real time as possible.
Your opening is a little rough too. You essentially have two separate opening paragraphs.