what is the best web site stats program out there?

Free? Do you want to pay? Single site or multiple?

www.urchin.com in our opinion for shared web servers.

Webalizer has always worked for me, the fact that it is free was a great benefit as we were starting up, but even now we dont require anything else.

I really like modlogan - http://jan.kneschke.de/projects/modlogan/