This is an application that should have originally came with the App Store. This application sends you a push notification every time one of your installed apps has an update. You can configure the app under your Settings app to check hourly, daily, weekly or monthly for new updates. There’s also an ignore list so you can disable notifications for certain application updates. I use the ignore list for Apple apps that recently updated for iOS 5.1 that I do not want to update because I’m still on 5.0.1. This application is $1.49 in the Cydia Store.