Since I started using N9 several weeks ago I am missing one very important(to me) feature - reminder for missed events(missed calls, sms, etc.). This was added to N900 thanks to remarkable application CallNotify(http://talk.maemo.org/showthread.php?t=48501)
It will be great if somebody comes with similar app for N9. Yes, visual reminder on lock screen is good, but a sound and/or vibration configurable reminder will be superb in terms of convenience.