How to track user activity using ASPSESSIONID

Hi,

We have a secured website and a user needs to create an account before they
can log in. After they login a session cookie
(ASPSESSIONIDQABTBBAB=MOPPDDHDOKBJCJFOINAHCJKD) is created to identify the
user. We have this session cookie in the IIS 6 log file and I would like to
know of any software that we can use them for tracking user activity other
than WebTrends.

Thanks

Joe