An interview with Siri
Here's a nice interview with Siri from slashgear where we learn some more things about Siri, the meaning of life and how Siri works.
Impressive demonstration of what Siri can do on the iPhone 4S
This is not a demo by Apple, it's a real demonstration at an Apple store by customers/journalists (stuff.tv) http://www.youtube.com/watch?v=MKRwV3DTVLo&feature=player_embedded