[pirko]

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

[onlydnaq]

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.