All Cryptoflex are supported by OpenSC, tested very often and work fine.
Cryptoflex 8k cards however are too small, so the default profile does not fit on the card. Not even the small option is small enough to make it fit on the card. However you could edit the profile file to make it even smaller, then it should work again.
Documentation is available at [http://www.cryptoflex.com/].
Cards can be bought at [http://www.scmegastore.com/].
Sell also SchlumbergerEgate - a combination of the latest Cryptoflex card with a mechanical adapter to make the card speak usb.
Works fine in smart acrd bundle 0.3rc2 on windows xp (cryptoflex 32k with plug in egate token adapter, driver 2.6.0).