For a few screen shots see this:
Short summary of new features:
* Support for archiving historical data automatically or manually.
This will reduce the required storage on the database and improve
* FireStats now shows search engines search terms used to get to
* It is now possible to set the starting (baseline) values to page
views and visits for each site
* A new system diagnostics page was added, the page will
automatically detect various problems with your FireStats
* Its now possible to send anonymous system information that will
help me make better decisions about new features.