If you click on the domain and then "setup" in the control panel there is an option to create a password protected folder for stats that is web accessable.
(accessible via password protected directory '/plesk-stat/' )
Username and password are the same as the FTP sign in.
yaniv, I should have mentioned that you could create a virtual directory in httpdocs using remote desktop that would point to the stats folder. Make sure permissions are correct so you don't have a security problem.
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