Wow, I really appreciate the folks bringing attention to this possibility, even though this is an old thread. For what it's worth, T-Money cards (SK) can also be read using similar apps!

I'm also hoping that the next iPhone is able to read these as well.

Are there any security concerns to be aware of with using these apps to read the cards? I'm assuming there isn't, but don't know much about implementation details for financial and other prepaid cards. For instance, I didn't even realize that the balance is stored on the cards themselves. It makes sense in retrospect though, the laundry cards at my college dorms worked the same way.