Google has amassed 150,000 advertisers worldwide, thanks to an aggressive international growth strategy in Web search , the company said Thursday.
[news.com.com...]
With that much money coming in, try to stay even cleaner on your results page and leave the top-northern banner away to make place for related searches [webmasterworld.com]
Left is search results - right is advertising - used to be a very clean presentation.
Some countries/languages serps in niche areas are still so virginally clean, I would not dare to advertise and let the ignorant competition have an idea. On the other hand:
I had a client coming in recently congratulating me on the single little "award box" Google gave me to the right of the search results
"Google Awardwords program" :)