Banner based alerts were introduced with iOS 5 and they wre met with a very positive reaction. That being said, Cydia wouldn't be as popular as it is if new features couldn't be enhanced by the jailbreaking community. The Sticky Icky package has just been released and this is a tweak where developers have attempted to make Apple's banner alerts a little bit better.
The banners and alerts were created intending to work hand in hand with the Notification Center hub that was also introduced with iOS 5. When a user receives a notification, a temporary banner is displayed at the top of the screen with the intention of notifying the user while not distracting them or drawing focus away from the app that is currently running. When a user installs Sticky Icky which is a new jailbreak tweak the banners and notifications become sticky and they remain stuck to the top of the display. It will remain here until users decide to either tap the banner and invoke the relevant alert action or dismiss the banner from view altogether. The main purpose of this tweak appears to be to bring a more permanent state of visibility to incoming notifications.
This package works really well and will help anyone who has suffered from missed alerts in the past. When you install this tweak you also get a dismiss button to the right hand side of the incoming banner alert and if this is tapped on it immediately removes the banner from view. Sticky Icky is available free of charge from the ModMyi repository and you must have a jailbroken device running iOS 5.0 or above.