Nice, but linux-only and requires special kernel support. cfs supports lots and lots of different OSs and doesn't require kernel modes. So far as I know, in this regard cfs is unique among cryptographic filesystems.
The only thing close that I've seen is Bestcrypt, which is commercial and has a Linux and Windows port. I don't recall if the Linux port came with source or not. I had problems with the init script hanging the boot process, or at least delaying it significantly, so I uninstalled it until I could devote the time to analyze what was going on. Right after installation I tried using it to read a container copied from a corrupted Windows machine, but was not successful. It is unclear to me if this was due to the corruption which occured, or some kind of incompatibility between the Windows and Linux ports. -- http://www.lightconsulting.com/~travis/ -><- "We already have enough fast, insecure systems." -- Schneier & Ferguson GPG fingerprint: 50A1 15C5 A9DE 23B9 ED98 C93E 38E9 204A 94C2 641B