Very good information - thank you.

Has anyone experimented (yet) with CardSpace and SharePoint?  I am surprised I have not seen many sites (Channel9? Ahem, ahem) supporting this yet.  From the demos I saw early on, it seemed enabling CardSpace was literally a few lines of code in a server.config file.  Seems anyone who supports forms and/or MS Passport should be able to support CardSpace fairly easily.  And, it seems the sites that drink the MS Kool Aid (Channel9?) should be among the first to support...