Forms
It has become increasingly important to offer a Contact form and not an email adress on a web page. With the number of scrapers ( content extractors ) currently running amock on the internet, it is wise to use a secure form. i.e a form that can validate that a humanoid, with a certain amount of certainty has filled in the form.
However, there also appears to be bots that attempt to fill in forms ( form spammers ) and attempt to abuse systems and resources. So a good form needs to use Captcha and or other forms of validation. This will reduce the amount of bad bots attempting to abuse forms.