I've had a very brief look at Windows Identity Foundation (WIF) and it looks to me like I could say that my site is going to accept logins from other sites. e.g. anyone with a gmail or LiveID account will be able to post comments on a thread in my application. When the post comment button is clicked the user is redirected to a provider and they log in there, after which they are authorized on my site to post.
How can I find out who offers the STS mechanism and what the URL is to feed into WIF?
I've found the LiveID through a bit of googling but if I wanted to find the Facebook service, or Yahoo etc how do I go about it? Searching for STS providers and its various incantations isn't turning up too much.
Many thanks
The beta has been released fairly recently which includes a few STS providers for things like google and facebook for anyone that views this later