Hi,
great plugin & a big timesaver both back- and frontendside, I just thought it might be best to mention wp-config.php explicitly in the description (and maybe http://codex.wordpress.org/Debugging_in_WordPress).
Also, I think you should mention that only the object cache is displayed by default (i.e. when SAVEQUERIES is switched off).
Both might help when people want to give it a quick first try & wonder what's the output about when they hit 'debug'...
