Best way to expose Password Registration Portal to the outside

Hello,

We are an educational instituiton currently attempting to provision the Password Reset and Registration portals so that they can be used by Online students who are obviously not domain members or on a campus.

The reset portal is working just fine as it is Anonymous Auth and I would like to have some way to use a form to authenticate from the outside for remote students to get to the registration portal without having to have students enter "domain\username" and "password". And then at the point to have to enter the password again.

What is the suggested or preferred way to accomplish this? TMG/UAG?

Thanks for your time,

Seth Mall