MailTo Protocol - Avoiding Spammers

This technique involves converting an email address to an array of integers: the Unicode value for each character.

<a href="javascript:void(location.href='mailto:'+String.fromCharCode(105,110,102,111,64,115,
111,108,116,101,99,104,46,110,101,116)+'?')">Contact Us</a>

A tool to help you build the HREF attribute can be found here.