Given the obvious tendency to drastic understatement I'd venture a guess it's way more than 200, probably way more than 250. The Adowrds dep certainly would like to present higher (more realistic) figures, while the "We are your friend" dep doesn't like huge, scary figures at all. 150 dates back to early 2001, if memory serves me. In that time Google has captured gigantic marketshares worldwide. Europe has last year outgrown the US figures for web access. No hard figures here, but my estimate is between 2001 and today Google has gone from far below 50%, rather in the 20-30% range, to 60-80% across Europe. In a country like Germany alone with some 50-60 Mill people with Internet access Google is at 80+% of search traffic.
Automated searches/queries count in their results. I used to run reports very often with bajillions of keywords and such so i know they had quite a few queries from me. However now adays im nice due to the people on here discussing the topics and consequenses of the action.
I use google more and more for everyday use though and each day refer it to people, im sure there doesnt go a day where i dont say the word google to someone. ;) keep those numbers rising, the more they hear it the more they use it and the more my adwords are displayed.