OpenSoShell - OpenSocial developer tool

OpenSoShell is a tiny open social gadget that can help developers run OpenSocial
Javascript API snippets directly within an opensocial container like Orkut or Hi5.
It is not meant to be a full fledged IDE or development environment. But it can help complement existing gadget development tools like Firebug.

I have released it with an Apache license. Feel free to give it a shot.

http://portalzone.googlecode.com/svn/trunk/opensocial/opensoshell/opensoshell.xml

Update:
Here is how you can get started. Signup for an orkut account and request for sandbox access.Install the gadget by pointing to the URL from the the "My Applications" page.
You can find detailed instructions here: Orkut Developer Guide

You can also check out the video tutorial series.