Best method for foiling email harvesters?

pjp6259 writes: "One of the common ways that spammers generate email mailing lists is by harvesting email addressess from websites. But in many cases you also need to make it easy for your customers to reach you. I have found three common solutions to this problem:

• Use an image to replace your email address.
• Use ascii encodings for some/all of the characters.
• Use javascript to concatenate and/or obfuscate your email address.

Which of these methods are most effective? Are email harvesters able to interpret javascript? What do you use?"