Getting Keyword Estimates is easy (once you’ve chosen your keywords). All you need to do is enter your list into the Google Traffic Estimator Tool, leave daily budget empty and put max CPC at $99.
The results will show you how many clicks you could expect to receive and what the cost of those clicks would be. Keep in mind that the tool does not take in to consideration geo-targeting, fixed positioning, or content-targeted/placement bidding.
Try the tool yourself here.
Great ideas.