Contactify looks like a good idea. You give them your email address and they give you a contact form. Hmm you still have to give out your email. Why? What if these sites get hacked or start selling your emails? How about this?

1. You sign up with a user name and password.
2. They give you a contact form.
3. When someone contacts you it gets added to a RSS feed only you can access on the site.
4. If you want you contact someone back or let the RSS item expire.
5. No email account used, no chance of spam.