Avoco RealPay etc

In case you have not done so please have a look at Avoco's Information Card work.

One of their demo sites is a site called RealPay. Here you see the current openinfocard selector at work:





But the above is only the "normal" Information Card scenario.
Much more interesting are their "cloud selector" and their Cardspace based document signing product. The latter can sign Microsoft Office documents and PDFs and if you try to open that document you have to present a valid security token based on an Information Card which might be restricting your access even to your current location. Nice.
Read more here.