iOS (Jailbroken): Cydia provides access to a lot of really cool jailbreak-only apps, but it can't actually tell you whether you have new updates until you open it up manually. A new app called Curiosa puts Cydia updates right in the Notification Center, so you're alerted as soon as an update is available for your favourite jailbreak apps.
Installing Curiosa is all you need to get updates, but it can do a lot more than that. You can set it to check for updates on whatever interval you want, check on Wi-Fi only, manually refresh with an Activator action, and even set keywords so it only searches for specific apps. To install it, just add the
http://rpetri.ch/repo repository to Cydia under Manage > Sources.
Curiosa is a free download for jailbroken iOS devices only. If you like Curiosa, you might also like AppUpdateNotifier, which puts regular App Store update notifications in the Notification Center as well.