Just thought I'd ask what commands you thought up which surprised you in their effectiveness. I just told Siri "I don't like this song". Siri responded with a "Ok, I'll remember that" & proceeded to automatically skip the track. Nice little 'kill two birds with one stone' moment. (I've also mentioned elsewhere that asking what the track name was, what album it's from & what year it was released all returned accurate responses from Siri).