> Together with -R, it can help chase those memory leaks which aren't 
> reference leaks (see c6dafa2e2594).

Valgrind does a much better job at this: it will also show you where the leaked blocks were allocated.
OTOH, Valgrind is Linux-only and slow, but since I haven't used the '-R' option much, I don't know how usable this will be in practice (detecting memory leaks is one thing, identifying them is even better :-).