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Secunia Personal Software Inspector checks everything and tells you is there is a patch or update available. Autoupdate is great for your software like browsers or your OS that do so, but this will also help you keep the rest of your software up to date as well. There are other choices for Software Update Monitors, such as Software Update Monitor Lite (SUMo), and Update Checker from FileHippo. I prefer Secunia PSI, it has won a few awards from ZDNet and PC World, and it available as a free download.