In a recent post to the Web Development Blog they talks a look at some methods you can use on your site to help reduce the amount of spam sent to email addresses by protecting them from scripts that might harvest them right from the page.

There are lots of spam bots checking the Internet for email addresses on regular websites, forums, blog and mailing lists. Once caught by some spam bot your mailbox is in need of a strong spam filter or sometimes it might be better to use a new e-mail address. In this article we show you different ways, how you're able to show your e-mail address to human visitors and hide it for spam bots.

They give four solutions, some a bit more practical than others - using an image instead of the text-only version of the address, hiding the @ symbol, hiding it with PHP (converting it to ASCII) and using Javascript to handle it similarly.