I saw this in a thread yesterday (but can't find that thread today) about someone asking if anyone used PIWIK before. So I downloaded a copy, and last night tossed it up on a domain.
What a bad ass little piece of open source softare. Its molded from Google Analytics but is opensource (runs off your own server) and allows the ability to add modules or plugins to the system so its easily customizable. VERY EASY TO INSTALL AND GET GOING.
Haven't noticed much lag on the server its on right now, and none of the pages hang while its loaded, very crisp, excellent data, A+ for sure. With some little tweaks I could see this being very valueble to those of us who don't want to use Analytics for whatever reason.
http://piwik.org/
(man I'd love a link on that bitch)