Google AdSense is the Internet marketing platform that allows people to place ads on topically-related websites. Using the operating system within AdWords, Google's paid search engine service that places the sponsored listings above and to the right of popular search results pages, advertisers can distribute their ads throughout Google contextual network of advertisers. The process is almost instantaneous: when publishers go live with a new web page that has the Google AdSense code within, the system finds advertisements that match the content and place them in webmaster-defined areas. These ads are available on thousands of websites.
A recent thread at Digital Point Forums discusses the practice by some publishers of removing the "Advertise on this Site" call-to-action that is embedded in the ad layout. Some interesting reasons and thresholds are given, including one participant who advises:
My advise is take it off if you're getting less than 5000 impressions per day per ad. Leave it on if it's more. High impressions ads tends to attract bidders to sponsor the ad space.
For those of you in the game, you may want to see some of the arguments behind this Google-allowed layout edit. The discussion is found at Digital Point Forums.