Google has just activated a feature in AdWords which should save pay-per-click (PPC) advertisers' time diagnosing issues with their keyword quality score. Now, when you hover over the status bar of your keywords, a dialog box appears with 3 new quality score indicators. These indicators are for Expected Clickthrough Rate (CTR), Ad Relevance and Landing Page Experience and they are rated according to Below Average, Average and Above Average.
Thanks for the update.. just checked the option.. it's really helpful to advertisers to check and improve their quality score.