Your stuff is here, here and here. Rely on it

Luke Shepard posted about avoiding Open ID Nascar and detecting the user’s provider.

I was pitching something like to Luke, Wei and Joseph Smarr at the Open ID UX summit (without all the Open ID details).

I think there are going to be about 10 providers which people actually want to sign in with; but you can't show 10 choices.

Sniff out the ones the user has ever signed into via a JSON request or an image size hack.

Then you could also surface the "why use this provider" in an iframe (i.e. if you are visiting the WSJ and it shows):

• You are a user of Facebook (3 of your friends are on the site, post stuff to your wall)
• you are a user of MySpace (0 of your friends are on the site)
• you are a user of LinkedIn (12 friends are on the site, share stuff with your professional network)
• You can click to show way more places of where your stuff is stored.

You think this is interesting?: should i document it a bit more?