Single-Sign-On choices to use with Windows Phone 7

Question

What types of Single-Sign-On what can I use with Windows Phone?

Now, I'm using Facebook Single-Sign-On. But I don't know if I can use, for example, Windows Live ID, Google, Yahoo, etc.

I don't want to make users of my app register again. I need users registered, but I can use another ways to sign in in my app.

Answer 1

OpenId for Windows Phone 7 - SevenAuth. Here's a demo video.