jatar_k - 2:46 pm on Mar 3, 2008 (gmt 0)

you can't rely on ip being a unique identifier of a single user, take AOL, anyone on AOL has the same ip as innumerable others.

unique is a difficult thing to track

are they logged in, logged in users can always be uniquely tracked. You could also use cookies, that would get the number closer to reality.

if not then the true number of unique is somewhere between the number of page views and the number of unique ips