Phoronix has a really well-written article on ZFS, including news on a company planning to release a CDDL-licensed linux kernel module.
ZFS is the holy grail of filesystems. Many Database Administrators have switched from Linux to Solaris because ZFS has much better snapshot support than LLVM, as well as good SSD support.
phoronix.com: Native ZFS Is Coming To Linux Next Month (Aug. 27, 2010)
phoronix.com: Btrfs, EXT4 & ZFS On A Solid-State Drive (Aug. 9, 2010)
phoronix.com: Benchmarking ZFS On FreeBSD vs. EXT4 & Btrfs On Linux (July 27, 2010)
phoronix.com: Running ZFS With CAM-based ATA On FreeBSD 8.1 (July 26, 2010)
github: Native ZFS for Linux
FreeBSD Wiki: ZFS
