Secunia has released a new service called Software Inspector to inspect your operating system and software for insecure versions and missing security updates. A default inspection normally lasts 5-40 seconds, while a thorough inspection may take several minutes. One way to keep your system safe is to have the updated version of each application which (normally and ideally) is more stable and less bug than previous version. This service uses Java (i guess) and the only thing you have to do is to click on the Run button and it will start scanning your computer and verifying it whether it has the latest version or have all the patches installed or not.
If you have slow Internet connection, please don't use the thorough scanning as it will scan almost everything in your computer and i guess it will take much much longer than normal scanning. Also it will increase your system's load, so do it at night or at morning.
So far, i only test this application in Windows and i haven't tested it yet in Linux operating system. I hope they made this application portable to be executed under every platform available. If any of you have tested this service on Linux and it's working, please let me know and i will test my system also.