The below mentioned "Detail" section has been implemented - simply hover the cursor over a nametable tile, sprite, pattern table tile, or palette entry, and it will be displayed magnified and with appropriate details. Right-clicking on an object will cause its details to remain displayed when you move the mouse over an empty area.
March 14, 2009
The PPU Debugger now displays sprites, arranged in a 16 by 4 grid.
A "Detail" section has also been added - while it currently does nothing, it will eventually be made to display details about whatever the mouse cursor is currently pointing at (in similar fashion to rveach's modified Nintendulator debugger).