In OS X Lion, Apple has removed an interesting feature: the Smart Card support. With Mac OS X (since Tiger), it was possible to authenticate (for example) with a Smart Card, as the U.S. military CAC card or with a Belgian electronic ID card (in particular). But with OS X Lion, the support is deprecated so no longer supported. And suddenly, the necessary files are no longer available.
I intended to propose a test on this feature in a few weeks, but without the support, it will be a bit complicated. Hopefully Apple will propose a new solution in the future for the management of smart cards, even if it is not likely to happen.
Mac OS X