Don’t feel like giving out your email address? How about a URL that anonymizes your email address? Contactify apparently does that, and uses a CAPTCHA to reduce spam. If you have your own blog on a self-hosted domain, however, I’m sure you can find a free form plugin. In fact, anyone that works online should really consider buying their own “FirstnameLastname.com”, or close variation, and using that on a Moo card. Now set up a contact form on your personal site’s “contact me”, “about”, or “services” page. Then anyone who needs to get hold of you can just use the contact form. What could be simpler? You don’t even need business cards in this case. If you don’t want to go to the trouble, then Contactify is a (supposedly) nice alternative. Of course, if you are ultra popular, you may get too much email disrupting your workflow. In which case, you may need to use an extreme email message classification system.