Adsense Spy

Want to know if the webmaster of a site is managing a few others? Then you can spy what he's doing by tracking his Adsense ID.

Example with the site EcoGeek.org:

- With ServerSiders.com: Domains using the same Adsense account as ecogeek.org
http://serversiders.com/ecogeek.org

- With DomainCrawler.com: in the story of ecogeek: "The Analytics/Ad-codes pub-0578044100560991 and UA-385778 is also present on the domain, which it shares with 10 websites."
http://www.domaincrawler.com/domains/view/ecogeek.org

- Ownerspy http://www.ownerspy.com/

- AdsSpy.com http://adsspy.com/search.php?q=ecogeek.org

- Google http://www.google.com/search?hl=en&safe=off&q=pub-0578044100560991&aq=f&oq=&aqi=

Note 1: Domains hosted on the same IP-address can also give clues, but you have to filter the results if it's a shared hosting. Can do a reverse ip search with Bing:

- MSN Bing Reverse IP Search

Note 2: Quantcast, Alexa Google analytics and ad networks id other than adsense's can also provide with clues, don't ignore those tidbits of information!

Do you have other tricks to stalk and track a webmaster?
:)