Secunia

This tool is amazing, I've installed this at home and it's your one stop shop for all your software updates. This tool will tell you when you're programs are in need of patching, and in a day and age where keeping your computer patched and up to date is essential to security, this is the best thing since the invention of the wheel.

It's a simple program to install, and so far it's free, but I imagine like all good software eventually it will come with a price.

http://secunia.com/