Like in 3.0's it was in Settings -> Notification and set ?Notifications? to ?Off?. Is there a way to do this in iOS 4? I did a Restore as new phone when I upgraded and I was going through the battery saving things and can't find this.
I'm running os4 and the notifications tab is third on the list in settings. Tap on it and it takes me to a screen where the first option is turning on and off notifications.