The following is copied and pasted directly from the PC Magazine
article entitled "Protect Your E-Mail Address" by Brian Livingston;
dated June 22, 2004. Used without permission but credit is given
where it is due! (www.pcmag.com)

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Professional spammers constantly scan the Web using high-speed programs
known as harvesters to capture visible e-mail addresses. Harvesting 
addresses in this way is illegal in the U.S. under the CAN-SPAM Act, 
which became law on January 1. But that hasn't stopped the practice.

Does this mean you can never put your e-mail address on a Web page? Not
at all. If you use the right methods, you can let people know how to 
get in touch with you—and still keep spammers from harvesting your
address.

The easiest way is to spell out the "@" sign and the period, like this:
brian at example dot com. In the Center's study, addresses that had been
obscured in this simple way on Web pages did not receive a single piece
of spam.

Unfortunately, though spammers' current harvesting software isn't smart 
enough to replace the spelled-out symbols, this won't be true for long,
as the programs are continually improving. To ensure that harvesters 
can't read your address now or in the future, stronger steps are needed.

To make your address truly invisible to harvesters, display it only as
a graphic. Open Microsoft Paint or a similar graphics application and
select text mode. Type your address, switch to the Select tool, and
select the area where your address appears, saving it as a GIF <or JPG>
file. Post the graphic on your Web page, and you're done.

Although optical-character recognition (OCR) programs can read letters
and numbers in image files, it's unlikely that a harvesting program 
will ever use OCR. Setting harvesting programs to scan every image on
the Web would slow them down severely and wouldn't be cost effective.

If you have an e-mail link on your site, it's important that the HTML
code behind it does not contain your e-mail address in plain text. 
Harvesting programs can easily read code, not just the characters 
visible in a browser.