I think something happened to Siri (kidnapping?!): on my last trip home tonight, the interface changed to a blue screen-saver-type thing with "Voice COmmand" at the top of the screen. She sounded the same, but was more efficient!
Was there a stealth update or something?!
EDIT: Oops! I guess I turned it off somehow--looks like it can do some things without sending stuff to Apple? Sure seemed more efficient, but I suppose that's because it wasn't connecting externally. Anyway, nevermind. As you were...