Agreed. He's shown that he can take anything, even crap, and figure out how to sell it better. I think that this example WOULD sell Firefox, for instance. However, I find that a lot of his stuff IS crap, and marketing doesn't fix that. Squidoo, for instance, is terrible and pointless, even if it IS on the Alexa 500 (and I'll never know WHY it is, for that matter).
Frankly, I'd prefer Firefox NOT market itself and focus on making itself the best browser it can be. It's not good enough right now to create good marketing, so it shouldn't bother.