Can you describe exactly what happened? This is very rare. Also, t-rave, your experiences sound like they were in Mac OS 9 - which did crash constantly! Mac OS X is a different beast entirely and I rarely have seen it crash.
Also this depends on how we define "crash." Did one application die on you? Or did the whole OS go down? That is a BIG difference IMO. Single buggy applications crashing is not the fault of the OS. And yes, sometimes that "buggy application" can be Pro Tools or whatever DAW you use, although I haven't had those go down in ages.