Right now, the queries are pretty limited (only a few to select from), but I am working out a new way of doing this - my intent is to have XML-based reports definitions that allow you to save and run any type of query that you like.
Not only that, but you should be able to trade queries with other users and completely customize your reports within BerryStats.
The page will have a way to define your own SQL query, and also grant you the ability to save and name a query that works for you. Also, I will add a feature to email the results to a SMTP recipient.
Should prove to be fun at the very least...