A WebmasterWorld thread reports that Google is indexing and ranking ads from Google AdSense.
To see evidence for yourself, just search on this popular Google AdSense ad found throughout the web for a Google product. Here, search on "Get The Data You Need Faster". Up comes many results, many of those results are triggered from Google AdSense ads, most from Google Parked Domain ads.
Here is one example of a parked domain ad with the Google AdSense ads being indexed:
I don't believe this is a new occurrence, but it should be pointed out and corrected by Google.
Why? * It skews advertiser's results by letting GoogleBot crawl the pages * It shows up in the Google cache * Google ads should not be indexed by Google as part of your page content * and more...
Forum discussion at WebmasterWorld.