John McWhorter writes about the death of languages:

The main loss when a language dies is not cultural but aesthetic. The click sounds in certain African languages are magnificent to hear. In many Amazonian languages, when you say something you have to specify, with a suffix, where you got the information. The Ket language of Siberia is so awesomely irregular as to seem a work of art.

But let’s remember that this aesthetic delight is mainly savored by the outside observer, often a professional savorer like myself. Professional linguists or anthropologists are part of a distinct human minority. Most people, in the West or anywhere else, find the fact that there are so many languages in the world no more interesting than I would find a list of all the makes of Toyota. So our case for preserving the world’s languages cannot be based on how fascinating their variegation appears to a few people in the world. The question is whether there is some urgent benefit to humanity from the fact that some people speak click languages, while others speak Ket or thousands of others, instead of everyone speaking in a universal tongue.

Lera Boroditsky, a professor of psychology, neuroscience & symbolic systems (aww.. the very words sound sexy), writes in a brilliant article on how languages we speak shape our thoughts:

Follow me to Pormpuraaw, a small Aboriginal community on the western edge of Cape York, in northern Australia. I came here because of the way the locals, the Kuuk Thaayorre, talk about space. Instead of words like "right," "left," "forward," and "back," which, as commonly used in English, define space relative to an observer, the Kuuk Thaayorre, like many other Aboriginal groups, use cardinal-direction terms — north, south, east, and west — to define space.1 This is done at all scales, which means you have to say things like "There's an ant on your southeast leg" or "Move the cup to the north northwest a little bit." One obvious consequence of speaking such a language is that you have to stay oriented at all times, or else you cannot speak properly. The normal greeting in Kuuk Thaayorre is "Where are you going?" and the answer should be something like " Southsoutheast, in the middle distance." If you don't know which way you're facing, you can't even get past "Hello."