Google also does this if you proxy your requests through a cloud IP space. I proxy my Google searches through rackspace IPs and I was given a CAPTCHA on nearly

Google also does this if you proxy your requests through a cloud IP space. I proxy my Google searches through rackspace IPs and I was given a CAPTCHA on nearly every search. I actually stopped using Google because of this (and privacy/creepiness issues). I switched to Bing. I have to say, Bing has gotten really good. When others saw me using it, they started using it too. Most of my office has switched now and people have stopped saying "google it" and started saying "bing it".