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Drupal for Firebug Rocks!
I have tried and really like this module. Totally worth the load.
It can relieve you from writing "print_r($form)" and "print_r($vars)" a million times.
It exposes lots of other great variables too.
If you use Firebug (you should) you'll love this module.
Just look at the screen captures!
Regards,
Michael Hofmockel
iMed Studios
Open Source || Open Access || Open Mind