What are some good tools, if any, for Gtk3 / Gnome Shell theme/extension development?

taxi

New Member
I am a seasoned web developer (XHTML/CSS/JavaScript/X-Browser), and have just installed Fedora 15. Fedora is on the bleeding edge, and ships with Gnome 3 / Gnome Shell as the default desktop. I know Gnome3, Gtk3, Mutter, and Gnome Shell use web technologies for their theming and extensions. Is there a good editor/IDE for developing and testing these themes/extensions? I am currently working on a suite of Rubles in Eclipse/Aptana for this purpose, but I would like to save some time if anyone knows any better tools.
 
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