Did you ever wonder what websites your competitor owns? Were you ever interested in getting to know where the big affiliate guys make there money from?
If so....use Adspy.com! Adsspy is a new service that allows you to find related websites by comparing (among others) Google Analytics codes on a few hundred thousand websites.
Having tested Adsspy for the past 2 days I can say that this is one of the most powerful tools that I have seen in a long time. It can be used in so many ways and for webmasters I am not sure if it is smart to install Google Analytics throughout their properties anymore.
Just watch the example of Mortgage101 , which has only a few related sites:
Today Adssyp knows 1 042 892 IDs!
Number of known sites:
Google AdSense : 770+ thousand sites
Google Analytics : 620+ thousand sites
AdBrite : 25+ thousand sites
Chitika : 7 thousand sites
Yahoo Partner Network : 5+ thousand sites
Kontera : 2+ thousand sites
Amazon Context : 3+ thousand sites
IntelliTXT : 35 sites