Really enjoyed reading this article; http://morganlinton.com/why-i-think-some-of-the-hottest-new-gtlds-arent-new-to-us/ I've said it before, last year .co was by far the most ridiculously undervalued domain. I pretty much see it on par with .net/org from a development perspective, if not better, yet I still see people treating it at 10% the price of .net/org. Also seem to see new businesses and brands using .co hitting the news every week. e.g. Twitters new video site on Vine.co.