I first heard about Secunia when I attended a Malware-fighting conference hosted by Kaspersky in Boston. This online utility will scan your system (using a java program) for security vulnerabilities. Did you know that most people are vulnerable to system infection because of having an out-dated version of quicktime? That's right, if you don't keep certain plugins like flash and quicktime up to date you open yourself up to great risk of intrusion.

Do yourself a favor. Run the scanner and follow the instructions for updating the software on your computer, you'll thank yourself for it.