The Komodo Community site has been running Drupal for quiet some time. At OpenKomodo.com, Jeff posted a interesting article on a few quick tips to get the cool-ness of Komodo for your Drupal work see: http://www.openkomodo.com/blogs/jeffg/setting-komodo-edit-drupal-develop.... I make use of Komodo IDE at work and Komodo Edit at home.

I have not tried Netbeans that was so recently discussed on the Development mailing list, but not sure anyone can convince me to give up this tool.