View the source of compiled GSP

While grails is running in development mode, you can view the source of the compiled GSP by appending showSource to the URL. E.g.

http://localhost:8080/myapp/mycontroller/action?showSource

This trick is mentioned in http://www.piragua.com/2008/03/15/viewing-the-source-of-a-compiled-gsp-in-grails/ and was requested as an improvement in JIRA http://jira.codehaus.org/browse/GRAILS-2729.

I wonder how many more of these tricks are in grails.