The new jailbreak tweak AppUpdateNotifier ensures you will never miss another app update by sending you a notification when one is available. This seems like a decent tweak for people who use a lot of apps and are tired of missing updates.
The tweak sends notifications via Apple's built in notifications system even when your device is locked or asleep. You can set AppUpdateNotifier to check for updates hourly, daily, weekly or monthly, and you can even choose to ignore certain apps by placing them on the "Ignore List."
AppUpdateNotifier is $1.49 in Cydia under the BigBoss repo.