I noticed that AdSense puts the same publisher ID on all your AdSense ads. I was sort of worried about htis because I dont wan't people seeing all my sites. So I tried searching for the publisher id in Google and Yahoo and nothing showed up.

Do the search engines have an agreement or something not to index that information? Or is it just not showing up because it's inside Javascript code?

Is there any danger that someone can search for your publisher ID somewhere and see all your adsense sites?

I think some search engine can do it, but not big G.

people can spy on which website contain your adsense code. In fact, i do this often to know how the so called gurus do it. are they real or just piece of sh*t. unfortunately, we can't cloak our adsense code. the only for you to save from competitors is either register multiple adsense account for different websites or don't put adsense on website that have your own name....

Hope this helps....