Traffic analysis tool

Is there any tool that can check the visistors without referring to the log

[Roshu]

Is there any reliable tool that can check the traffic of a site? I need something that can not just analyse my own webtraffic but the traffic of all the sites I want to analyse. How can I make this possible?

[Receptional]

Any "tag" based one (uses code on the page) - select from tag based ones at:

[webmasterworld.com...]