Do you use Gmail? Read this.

Stop your email from being automatically redirected to a hacker's inbox via filters, or How a guy who runs a business from the internet spent three days of his vacation trying to get his domain name back.

Also, another neat little gmail tip: You can login to a secure gmail session by just typing https://www.gmail.com instead of www.gmail.com. This way, it won't be just your password that's encrypted, but your whole email session.