dhn, sorry about that
If you check the link that I posted above, you'll see that we probably won't need any other system-related statistics, if we have those implemented.
As for the portal-related stats, I think it'll be a bit hard to make a list of stat before we have a list a features, right?:)
If someone wants lots of stats on visitors to their site I'd personally recommend one of the many webserver log analysers.
Wait a minute, what if one hosts his portal/forum/site on a free site? Those "webserver log analysers" suppose you own the server, so you can feed apache logs to the script, right?