If you don't already know there's going to be an updated operating system ios5 for iPhone ect It's free just plug your device into iTunes to get updated operating system , loads of new features that look good Find out more here http://www.apple.com/ios/features.html#notification
The error could be caused by the millions of downloads at a time.
@mattc You can try to start up your iPad in Safe Mode. If it's the same as the iPhone then plug it in your pc/mac with the home and power button pushed. If the cable appears on your screen you should try to either reboot or get back to your last saved backup...
Just updated, wireless syncing, camera in lock screen, notification drop down screen, iCloud, photo stream are all good imo, could've done without the integrated tweeter bollocks though.
Yeah it's basically the same except it is interrogated with your text messages rather than a separate app and you know when you send and receive messages via the iMessenger as they appear blue rather than green and grey.
ended up creating a me.com id. cant see why i couldnt us my normal apple one that i get stuff off itunes but its signed in now. still not sure what it does though