I don’t know how well published this feature is. I’ve not seen it specifically called out anywhere and yet I find it to be one of the most useful features of the new iOS 5.0 notification system. It may be very widely known but I discovered it by accident so wanted to share.
When confronted with a list of notifications on your lock screen, you can hone in on a specific message and open the corresponding tweet, email (etc) simply by swiping left to right across that specific notification.
Take the screen shot below. If I want to open, say, the third message from the top, I simply swipe left to right on it and the phone unlocks, launches the appropriate app and presents the tweet accordingly.
What a great feature. Until discovering this I was simply unlocking the phone/pad, launching the appropriate app and then finding the tweet or email or Instagram message.
Hope you find it useful.