Everyone on the internet uses email to some degree. This being true, you are more apt to spread your word and drive more people to your site by remembering these simple tools.
Signature files are by far the most important and least used tool available to internet marketers.
You can set up an signature file in every email client used on the internet today. A signature file allows you to automatically place text and links into your email messages without having to type it in everytime you send an email message. The PS section is probably the most read section of any letter in any form. People have been reading the PS section since before the Internet was available and even before computers. Include a quick snippet in your PS section and you are assured it will be read.