Tuesday, June 17, 2008
Check out Quantcast, it's similar to alexa, they extrapolate data from a couple of thousand test users. The good thing with QuantCast though is that they give you additional demographical data, such as site with a similar userbase, age of users, income, education, etc. QuantCast also has a free complete listing of sites, but only based on their US rankings, not worldwide.
QuantCast provides a full listing, that is, a ranking of several millions of sites. Have a look here or simply download their top 1 milion here