For all on OS X Mountain Lion.
There is an issue with the pcscd where when you boot OS X with your reader connected and card inserted, the daemon will not get launched properly.
Did not delve deeper yet but running pcsctest will say "Service not available".
Manually killing it so it gets relaunched will do the trick or just not connecting your reader while booting.
For all the eid applets out there, the result is the applet getting stuck on a "Please connect your reader" message.
A bugreport has been filed with apple, also hinting that it would be nice for em to update the ccid-driver and pcsc-lite for a change :)
As Ludovic states, the ccid-driver for example is 3 years old and by consequence is missing possibly bad support for 97 readers since t hat version :)
regards,
Wim.