Astute Chad’s News readers will have already heard about the Heartbleed vulnerability, but it’s something we all need to be aware of. Fortunately, xkcd has the best explanation I’ve seen to date. If you manage or own a website that uses SSL certificates for secure HTTPS connections, the linked page will check to see if your site is vulnerable.
You can also use it to verify websites that you visit, to make sure they aren’t open to Heartbleed attacks. Major sites have already patched their systems and installed new SSL certificates, so I’m thinking the real concern is the smaller e-commerce sites. (Note: If you use this tool to verify a site, do it before you open the site in your browser.)