I happen to see this in my account. You can access it by going to a campaign, clicking on tools and scrolling down and looking for "ad text ideas (beta)." Or you can try to go to this URL and see if that works for you.
The tool basically helps you find "effective words and phrases for your ads."
Here is a step by step of how it works:
Pretty neat and useful for many advertisers but I am sure professional AdWords providers have their own ideas for creating text for AdWords ads.
Forum discussion at WebmasterWorld.