Thank you for all of the help. I might not of explained real well.

Here is what I am thinking about.
I have two web sites with two different databases of membership. One is php and the other is asp.net.

Here are my thoughts since both sites attract the same clients I wanted to make different memberships available. One would be to site 1 and the other would be to site 2 with a third option of a combo membership to site 1 and 2.

This would be for existing and new members.

All of this to be managed from just one admin area with one payment area and of course just one sign in to access the areas they are approved to access depending on the membership program each has.

I hope that this makes things a little clearer. Am I looking at a major project and major expense? I hope that this is all workable and not to expensive. Would it be easier to re write the asp.net product to php? I am just at a loss in what direction to go.