Personally, when I'm in the middle of something on my device, I usually dismiss incoming notifications and normally end up forgetting about them. This can cause an issue if the notification is about an important text message or email. NotifyMeAgain is a brand new jailbreak tweak that prevents users from forgetting about pending notifications.
NotifyMeAgain reminds users about a pending notification by displaying it again after a period of time. It works by requiring you to set a timer after which you want a pending notification to re-appear. This is quite similar to how the "Snooze" feature works for alarms in the Clock app. The tweak employs swipe gestures in order to invoke a timer. For instance, you can swipe the notification banner to the right or to the left to choose a particular timer.