ClickHeat is a visual heatmap of clicks on a HTML page, showing hot and cold click zones. Requires Javascript on the client to track clicks, PHP and GD on the server to log clicks and generate the heatmap.
You should download it on Github where the project has moved: https://github.com/dugwood/clickheat
Real-time statistics WordPress plugin: you can browse, filter, export detailed data about visitors, spiders, search terms and engines; keep track of top pages, most used browsers and OS as well as generating charts for filtered subsets of data.