Carol Yoon has a wonderful piece on the importance of taxonomy in the New York Times. You should definitely read the whole thing, but here are a few choice paragraphs to whet your appetite:

[T]he ordering and naming of life is no esoteric science. The past few decades have seen a stream of studies that show that sorting and naming the natural world is a universal, deep-seated and fundamental human activity, one we cannot afford to lose because it is essential to understanding the living world, and our place in it.The piece is adapted from Yoon's new book Naming Nature: The Clash between Instinct and Science. I haven't read the book, but I just ordered it for my Kindle. It looks as if it will be both a wonderful survey of the history of taxonomy and a wonderful example of how a skilled writer communicates science to a broad audience.
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[T]o order and name life is to have a sense of the world around, and, as a result, what one's place is in it.
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No wonder so few of us can really see what is out there. Even when scads of insistent wildlife appear with a flourish right in front of us, and there is such life always -- hawks migrating over the parking lot, great colorful moths banging up against the window at night -- we barely seem to notice. We are so disconnected from the living world that we can live in the midst of a mass extinction, of the rapid invasion everywhere of new and noxious species, entirely unaware that anything is happening. Happily, changing all this turns out to be easy. Just find an organism, any organism, small, large, gaudy, subtle -- anywhere, and they are everywhere -- and get a sense of it, its shape, color, size, feel, smell, sound. ... [L]uxuriate in its beetle-ness, its daffodility. Then find a name for it. Learn science's name, one of countless folk names, or make up your own. To do so is to change everything, including yourself. Because once you start noticing organisms, once you have a name for particular beasts, birds and flowers, you can't help seeing life and the order in it, just where it has always been, all around you.