Mark_A - 3:31 pm on Jun 1, 2010 (gmt 0)

What adwords does show is exposures of an ad which is similar to how often the word was searched for, if that is your advert was on page 1 for that keyword.

I used to use another service, I forget the name [might have been wordtracker] but they seemed a better option for research and did not cost as much as using adwords for research.