In your debugging section, will you cover the method worked on by 280 North’s, Francisco Tolmasky, as outlined here at this Blog?
http://www.alertdebugging.com/2009/04/29/building-a-better-javascript-profiler-with-webkit/
Video of the above can be seen here:
http://jsconf.us/2009/francisco_video.html
Starts at 22:00. Ends at 30:20
Main point starts at 25:50
I believe this is not limited to just Objective-J, but JS in general.
NOTE: This is from April 2009, the same thing may be implemented in Firebug and Chrome by now.