Hi,
first of all congrats for your terrific ZFDebugger, i use it on any of my daily basis.
I made a plugin for XHProf profiler
I used the memory plugin for the skeleton to this plugin because the xhprof works at same time : predispatch and postdispatch.
check the code here, would be nice if you add to the main code of ZFDebugger,
http://code.google.com/p/nolotiro/source/browse/library/ZFDebug/Controller/Plugin/Debug/Plugin/Xhprof.php
and add to the bootstrap inizialization array the plugin 'xhperf'
no harms if xhperf is not installed, the plugin checks this, and do nothing if not its installed.
cheers.