The JEDchecker is now compatible with joomla 3.0 and I've added 1 new check to it. The xmlinfo check will display information about the extension that we are checking. What we currently output is the extension name, version and creation date. The extension name information should help you to fill out the "filename and install as" fields in the JED submission form.
The new download can be found here & is also available through the joomla update manager.