Lex Friedman:

But whatever the reason, I hope Apple changes its thinking quickly. I’m a fan of Siri on my iPhone, and I can imagine plenty of ways Siri could deliver awesomeness on the Mac.

Lex makes his case for why Siri should come to Mountain Lion and some ways it could work. I don’t know if I’d use Siri that much on my Mac. It seems quicker for me to just use the built-in data detectors to add an appointment or open an app using Spotlight.