Google launched a new AdWords feature "Analyze competition" in Opportunities tab. For now, this feature is only available to a small number of advertisers using the English language AdWords interface.
"'Analyze competition' examines your account's activity over the past two weeks and lists categories that represent the products or services you're advertising. Categories are based on actual Google.com search terms and are matched up against your keywords, ad text, and landing page text. For each category associated with your account, you'll see a bar graph, which shows your individual performance compared to the average performance of other advertisers in the same category.