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Tried with my transit card from SL (Stockholm Public Transport). Got "Unsupported card type: Mifare4k". I'm going to look into it more tonight.

You can find a presentation about the cards used by SL from last years SEC-T conference here http://www.sec-t.org/2010/presentation-videos.html

The name of the presentation is Hacking the RKF ticket system, it can be found at the bottom of the page.