Well, one of them I've just progressed to "useable" status is a Facebook fan page previewer at preview.steadyhelm.com/path/to/your/server/ - Just makes prototyping and cranking out fan pages faster for me as I don't have to set up an application, deal with setAutoResize etc.

Example: http://preview.steadyhelm.com/http://minim.co/facebook-pages...