The Google AdWords blog
announced three major changes happening to the AdWords marketplace. First, Google will now calculate the quality score of your keywords at the time of the search query. Second, Google has removed the "minimum bid" metric and replaced it with "first page bid." Finally, Google will no longer mark search ads as "inactive for search."
Google said they will be rolling out these changes to a "very small segment of advertisers within the next day or two." Google will be watching how this impacts those advertisers and will then decide when to launch this on a broader scale. Let me explain what these changes means in greater detail.
http://searchengineland.com/080821-210012.php