Hello Alcides,
let me clarify a couple of things.
* I am not sure I understand "cardspace is user-centric and openID is based on independent providers". CardSpace is based on independed providers too, no more and no less.
* I have never said what you quote in the post. What I said is that for high value transactions you may want to consider to take advantage of the higher assurance that cardspace provides; that does not imply any consideration about one system being better than the other for lower value scenarios

it was a pleasure to have a chat with you! I hope that the subsequent interactive session
didn't scare you. There we had people trying to acocmplish complex things, consequently the explanation dug very deep into elaborate scenarios... the average developer does not need to know anything about those details