The other day I found myself reading about a new Firefox plugin that will automatically select HTTPS for various websites (and you can make your own rules, too).  The plugin, created by the EFF, is named HTTPS Everywhere.

Basically it knows that there are several popular websites out there that do HTTPS as an option and will redirect you to the SSL-secured versions of those websites if you forget to do it yourself.  This helps you protect your privacy and security of your web browsing.