One question: Do you think a Google Search only searches for those keywords without taking other factors in consideration? Based on what i can find (checked the source of some plugins of Siri Proxy) Siri is basically just Voice recognition, not "magic". You can easily fake "intelligence" when binding keywords to actions. Basically google search does the same. What's the difference? The marketing.
I'd say those two and Wolfram Alpha are prime examples of this.
A nice example i can show you with Wolfram Alpha. As a marketer i would tell you how supernice and innovative Wolfram Alpha is and that you can talk to it and then show you this:
http://www.wolframalpha.com/input/?i=How+is+the+weather+in+B...
Wow, right? Alphas UNDERSTANDS you! It's awesome, buy it! But:
http://www.wolframalpha.com/input/?i=Don%27t+tell+me+the+wea...
Now, that's simple negation that is not understood. It's easy to fix that. It's still not "intelligence" or whatever Apple is calling Siri. It's simple keyword based approach. Unless someone proves to me that the iPhone has the computing power of really understanding humans, it's old technology in a new (and great) design with massive marketing. As always.
Once you see that, you'll see that voice searching for "weather Berlin" and asking "How is the weather in Berlin?" is basically the same. The first one is just faster to execute (type or say). Only with the second example you can go all crazy and tell people that you reinvented the whole business.
edit:
That said, what is wrong with this link is not how Siri works or who is best or whatever. It's the notion of "Apple was right all along, Google not!!" which is just stupid seeing for how long Google was investing in Voice Recognition. It never was a matter of who is wrong, both companies invested in this technology. Why does it alyways come down to "Apple is right" or "Apple has invented X and Company Y just copies it!", it's ridiculous, like the patent law. Let those companies just build and sell their stuff but don't do all this "Apple was first!" shit, it rarely is. Most products of most companies are really genuine!