http://crazyegg.com/
Crazy Egg adds a new dimension to analytics. It includes a heatmap where you can see where users are clicking on the screen, and other visual presentation tools. From $10 for 10 pages (10k pageviews), up to $100 for 100 pages (100k pageviews).
http://piwik.org/
Piwik is an open source alternative to Google Analytics. It uses the same type of javascript tracking, but is self hosted. It also has an extensive plugin architecture, so you can add / remove features fairly easily.
