This is a revised version of two recent concepts I posted:
Clearing functionality is now broken up into two parts:
Simply holding down on any of the icons on the lock screen removes it from view.
Since the notifications have a field they sit in, you can just pull down within that section until the Clear Notifications button shows. Slide the icon all the way over (just like native iOS 5 lock screen handling) to clear all the notifications. If you wish to hide the Clear Notifications option, either tap the home button or hold and drag up with your finger to hide again.
© 2012 Joshua Tucker