NoSpamEmailHyperlink
If you have any e-mail addresses in the generated source of your site, especially in href=mailto: type links, there is a good chance that those addresses will later start receiving spam e-mails from any number of servers.
Here are some good tricks to fool spammer spiders. written by Paul Riley. There is a simple Javascript trick and the rest is pretty much .NET, but if you develop in another language, you can still extract the concept and rewrite it to suit your platform.