Overture and Wordtracker show you how many times the word has been searched for, if you want to know how many pages there are in G for that term, simply search it, and it'll bring up the number... but don't know of any tool that combines both. You might get that info though in a stats program like Google Analytics but I rather doubt it.

Course if you are asking what your position is in the serps for those keywords, then get an API from Google and use a queery to see where you rank.