On the visible web page:
For more information, send email to email@example.com.
In the source code for the web page, the above should look like this:
For more information, send email to <A HREF="mailto:
Note: This technique is not by any means a foolproof solution - high end software such as that used by Google's™ search engine can still sniff out your email address regardless. But this technique will still certainly go a long way towards minimizing your exposure to less capable automated email harvesters.