As an online advertiser, you should pay careful attention to traffic quality issues. Our sophisticated Click Protection System is your first line of defense to catch invalid clicks. But it's also a good idea to monitor your own traffic, which you can do with Yahoo!'s tools. We have created some tips to help your efforts in this regard; you can find them in our Traffic Quality Center at http://searchmarketing.yahoo.com/trafficquality/tips_tools.php#1.