Want to find out the most popular words used to search Google are?
Here ya go.
This provides information pulled down from WordTracker which updates every day. I can’t say just how accurate the information from this site is, but apart from doing an adWords campaign, this is a quick method to pull down some useful stats.
WordTracker do offer a free trial so if you want to avoid paying anything ever would be to set up your own GoogleAds account, the process takes a bit of time because you need to confirm your address and credit/bank account so if you’re in a hurry just use the WordTracker free trial here.