In Funnel a contact record is created automatically when someone submits the form embedded in your website. This way you are getting a database of people who have inquired about you or your services that's ready to be put to good use.
When someone contacts you through your Funnel form, their name, email address and (optionally) company name are recorded. Additionally the newly created contact is linked to the deal that's been created. As a bonus, Funnel pulls in their avatar image (from Gravatar).
You can tag your contacts, and create notes on their profiles.