Bugs of Fire

I have been a fan of the Firefox plugin Firebug for quite some time.  It has really help me learn different web technologies and debug issues I have with my web applications.  So boy, how excited I was when I found FirePHP, which allows you to send log messages to Firebug directly from your backend code.  Not only that, it seems that there are direct interfaces to it using Zend Framework and Drupal, my current favorite PHP frameworks/CMS's.  This will be great with this current application I'm working on, that will more than likely be heavy in AJAX (which is had to debug).  If only I knew about this before I taught myself the framework I'm writing the application in, it would have made my life much easier.