Web Client Tracking

I have a client who wants to get a better idea of what path users take through his website, where they spend their time, what they're really interested in. He gets "Analog" and "Webalizer" reports, but those reflect the single-page-view perspective that HTML implies, and he wants session logs.

(I don't think he's quite clear on how much information he's asking to digest, but anyway...)

Anybody know of a package that breaks the stateless model of HTML and will give him the tracking he's after?

Oh, one that acutally works would be nice. He found one that launched a new perl script for each new page view on the server, and when it hit something like 2039 parallel instances none of the other CGI stuff would work.