Others Online (this company I work for) announced the beta launch of our Affinity Analytics service for publishers and networks. This is not like any other Web site analytics you've seen, and I'm here to tell you you should check it out!
Traditional web site analytics tell you about visits, page views, sources, etc. but nothing about your visitors. Our free Affinity Analytics service tell you about your audience and the topics/interests they care most about, based on how they browse not only your site but our whole network.
You can also click on any of the topics to see trending data/graphs over the past 7 or 30 days. This helps you understand total unique visitors and page views for any given audience segment, allowing you to target them by their interests and affinity strength.