Git keeps prompting me for a password

Question

I've been using Git for a while now, but the continual demands for a password are driving me insane.

I'm using Mac OS X and GitHub, and I configured Git and my SSH keys according to the instructions on GitHub's Set Up Git page.

As suggested on GitHub's SSH key pass page, I've also added the GitHub SSH key to my Mac OS X keychain.

Git has my public key on file.

Nonetheless, every time I do a Git pull, I am prompted to input my account and password.

Is there anything else I need to set up other than an SSH key for this?