We just built something like this for the health market. Users can auto-sigin to websites with one of their identities or set it to ask for each visit. Here is a lil demo I made that uses Craiglist as an example: http://tricorder.org/cl When the user goes to your website, say wellness.com/newcustomer, there are javascript APIs to get at your standard data, that brings up a perm dialog and if the user accepts, the data is sent to the website. Send me an email (profile) if you want to talk biz, tho was planning to open source it. Auth is very solid, but its currently android only.