The more I read about Siri the more I feel there should have been a new hard button to activate it. I'm not sure if Apple is going to use the hold the home button to activate it or not, but even that takes an extra 1.5 seconds to activate and the key to Siri being useful is to accomplish tasks quickly. A small hard button (maybe on top) where you can tap it once when the phone is unlocked or double tap it if locked (to prevent pocket clicks) would make it more useful and quicker. Siri is the ideal answer to not texting while driving. For that to work well you need a hard button to activate it. Maybe I'm being too quick to judge on this as we'll wait and see how it works in practice, but all the videos of it show an individual with his/her finger tapping the microphone of Siri and sometimes missing it and needing to tap it again. Siri is about changing the input device from touch to voice so why require touch to be so prevalent in it's functionality? Maybe the iPhone 5 will have a voice activated Siri even from the lock screen "Siri, please wake up...."