Basically, growl notifications (or other callbacks) when tests break or pass. Does anything like this exist?
If not, it should be pretty easy to wri
For your third question, maybe the trace module is what you need:
>>> def y(a): return a*a
>>> def x(a): return y(a)
>>> import trace
>>> tracer = trace.Trace(countfuncs = 1)
>>> tracer.runfunc(x, 2)
4
>>> res = tracer.results()
>>> res.calledfuncs
{('', '', 'y'): 1, ('', '', 'x'): 1}
    res.calledfuncs contains the functions that were called. If you specify countcallers = 1 when creating the tracer, you can get caller/callee relationships. See the docs of the trace module for more information.
You can also try to get the calls via static analysis, but this can be dangerous due to the dynamic nature of Python.