A really neat new plugin just came out, and I am about to go try it on my personal site. It is called Lightstats and it shows information in images, which for me makes it easier to understand and compare things.
This plugin generates a few bar and pie graph images showing statistics about posts, comments and categories.
Compatibility with PHP 4 / PHP 5 and WordPress 2. No external dependency, need only PHP compiled with GD and FreeType.
Check it out at Laitsas Site