Which debugger for use with embedded spidermonkey (non-web)

Hi,

I have been working with Spidermonkey, embedding it to make my application 
scriptable (to replace a legacy proprietary scripting language) and it is 
working well.  However I've reached a point where I want to start debugging 
scripts and I'm not clear which direction to go.

There seem to be various options (ie Firebug & Venkman) if I was debugging 
in a browser, but I need to debug *embedded* spidermonkey scripts and no 
browser is involved.

Has anyone else solved this problem?
What is the 'state of the art' in terms of spidermonkey debugging?
Is it possible to use one of the browser debuggers in conjunction with an 
embedded spidermonkey engine?


I know there are debug hooks in the spidermonkey API that would let me do it 
at a low level but I can't help feeling that someone else must have solved 
this problem before and I shouldn't need to reinvent the wheel ;)

Any advice or pointers to more info welcome,
Regards
Colin Fraser