I own some domains/websites for whom Alexa shows totally wrong information about number of visitors. Today I've seen Snapshot Compete and it shows very good estimates about number of unique visitors. How does Snapshot Compete work for your websites?
Great heads up. Compete has been around awhile. I have seen there numbers in various newsletters, but didn't know they released a free version of their service. Very cool. Alexa is officially off my quick links.