There's also GFS
GFS is the Global FIle System. You can find out
more about it http://www.sistina.com/gfs/. It's
not just a Journaled FIleSystem, it's also cluster
aware. It's meant to be used on a SAN, you can
actually read and write to the same filesystem
from many nodes at once. It's really a great piece
of software, the latest release is 4.0.