I came across this PHP Function while doing my morning reading, and thought I would share with others. I have not tried this method out, as I am a big fan of contact forms.
Use PHP to protect an E-mail address you publish on a website against bots or spiders that index or harvest E-mail addresses. It uses a substitution cipher with a different key for every page load.
Use this PHP code where you would normally place your email:
This is the generated HTML code that the bots will see instead of the actual email addy and this is what your visitors will see if they "view Source":
The PHP Function Code