How to distribute Trusted Root Certificates to all the computers on the Domain?

How can you distribute a Trusted Root Certification Authority's certificate to all the computers in a Domain? This happens a lot when you create a self-signed certificate or the Certification Authority you are using to obtain  your certificates does not come pre-loaded in Windows. The usual work-around is to manually install the certificate on each computer and trust it. How can you automatically distribute a certificate among all your domain computers so that they can trust the certificate?