oh, I'd go with Tlert.. by a long shot! having tried them all (including BiteSMS, IrealSMS, Mobilenotifier, QuickReply, etc..) Tlert really stands out as the best notification system (for SMS only, of course). it's super fast, flawless (for me anyway, with iPhone 4 32GB iOS 4.3.2 and NO WINTERBOARD). NO loading time, does not pop a huge notification popup like the others and does not force you to load the native SMS app if you want to reply or compose a new text. New SMS gesture is amazing and works flawlessly from whatever app you're in including lockscreen, the bubbles are nicely designed (evethough I don't care much for the internal autocorrect thingy) and it's just SMS notification the way it was meant to be. I can't see why Apple chose to go with Mobilenotifier for iOS 5, I guess it's just the most 'in iOS spirit' app, and allows them to cut distances with Android, but really, Tlert is the best when it comes to receiving and sending SMS. I can't even remember the last time I actually tapped my native SMS icon lol...