I've got an iPhone and I use Siri quite a bit while I'm walking to work, "what's the time?", "what's this song?", "message my current wife and tell her she's lucky", and so on.
The only bit that really annoys me about Siri is that I have to chose the Australian voice to get the best translation for my kiwi accent and then she answers me back in an Aussie accent, "All right, cobber, it's 10am and time for a smoko break", "it's Neil Diamond ya big poofter", "Wife? You should be so lucky, lucky, lucky", and so on.