I often install apps to try if they work the way I like. Some stay, some I delete almost immediately. Some of them have built in functionality that alerts you when there is an update available. I find that very annoying. If you have many apps these little reminders tend to pop up all the time.
So, I was looking for something to keep tiny apps up to date and found AppFresh. AppFresh will scan your programs folder when you want it to and alert you of any updates it can find. Downloading and installation is automated for most apps as well.
It will also tell you when you lasted used an application - nice if you want to clean you programs folder from unneccessary apps.
You can download AppFresh here.