I just wanted to add that if you install Quercus (currently 4.0.8) in the default-web.xml file, the admin interface will no longer work on GlassFish 2.1.1.
There is an error listed below which indicates that FacesServlet is unavailable so the admin interface will not work, nor will any JSF pages work in additional projects deployed to the server.
PWC1412: WebModule[] ServletContext.log():PWC1409: Marking servlet FacesServlet as unavailable
This may be a result of what Dominick Dorn notes about Caucho re-inventing the wheel with EE technologies.
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