Along with what is already displayed.(Stats, Order Status, New Customers, New Orders)
Thinking out loud, my ideas are:
Total Sales
Yearly Sales
Monthly Sales
Weekly Sales
(Maybe filtered by: Total, Customer, Customer Group (if featured))
Top Best Selling XX Products (XX = users selected quantity, i.e. 5, 10, 20, 50, 100 etc)
(Maybe filtered by, total, yearly, monthly, Weekly.. using a graphical representation of a products sales patterns?)
Search terms used > Top Search terms?
Most popular / visited non product content, i.e. ezpages, define pages.
If integrated to 2.0, the suggestion I made in the required features part of the forum, where customers can make comments (http://www.zen-cart.com/forum/showthread.php?t=171850 )
maybe a widget that shows Orders where a customer has made a comment / queried an order and an admin has not responded to it? Highlighting an admin need to review this order. If that makes sense? Although this could be done some other way, maybe have the Order Status automatically changed to 'Customer Alert' when a customer makes a customer comment on said order. But I digress.
Maybe a widget that displays top XX customers? By Total, Yearly, Monthly, Weekly??
Maybe a widget that shows the top XX registered customers that visit the site and browse the site, but don't checkout? (probs best suited to being an add-on?)
Number of Admin Accounts logged (on for large sites) That will only be visible to the Master Admin Account holder?? (probs best suited to being an add-on?)
Just ideas