Okay, so this trick is pretty obvious in retrospect, but nonetheless useful. I was inspired by this old post (http://www.blackhatworld.com/blackh...most-searched-keyword-youtube.html#post705276) which occurred before Google Instant. Basically, you clear all cookies (so you don't get any results from your searches) and then type in a few letters to Google. Google Instant will then give you the most popular searches. e.g. bla gives "black widow" and "blackberry"