I have posted my slides on my site for last week's talk on Introduction to Windows CardSpaces at the Southern CT .NET Users Group meeting on June 12.
It was a good meeting, but there were a lot of questions about how well will this technology be adopted. Unfortunately, at the moment, it is still a sparse number of sites that are using the technology (see the sites http://sandbox.netfx3.com/ and http://www.identityblog.com for a couple of examples that are using CardSpace). One hinderence may be lack of tools and some documentation for uses with ASP.NET and other environments.
Check out Dominick Baier's latest posts on updated ASP.NET controls for CardSpace and code to get CardSpace tokens programmatically. Great stuff!