Security flaw in OpenSSL encryption means that up to 66% of the websites in the world are affected by this. They're calling it the biggest internet security threat ever. FYI it's been there for over 2 years and they just found it recently. Changing your password is only recommended for websites that have taken action to remove the security threat. Therefore, outside of the big popular websites, you'll have to contact the website/server and ask them if your information is in danger. Banks are not affected, but if your password is the same as something else, you should change those too.
Here's How To Protect Yourself From The Massive Security Flaw That's Taken Over The Internet
The Heartbleed Hit List: The Passwords You Need to Change Right Now
Testing site for vulnerability
XI Wiki



