I've finished a first cut of CardSpace modules for DotNetNuke. Over the next couple of days they will be installed on this site for public demonstration and testing.
At the moment these modules do not allow users to create an account in DNN with an Information Card.
If you use the standard DNN process for creating your user account you can login to this site and link your Information Card to your DNN account.
After that, when you return to the site, you can provide your Information Card to sign in, or use standard DNN login mechanisms.