i agree i use sitemeter.com and have found it to be excellent. It provides an excellent reporting tool giving you info on:referers, search queries, time zones, sytems and much more.
check it out
Same here: http://www.SiteMeter.com. The pie charts/bar graphs are incredible. I can't get over how fabulous the service is. It's rarely down, and I've only had to email support ONCE in the 2+ years I've used them - and I got a reply back in 15 minutes!