The cool thing here is that, although they don't have the posix layer done yet, they do have all the pooling stuff working. That gives you scrubbing, snapshots, RAID-Z{,2,3}, etc. In their example page (http://wiki.github.com/behlendorf/zfs/example-zvol), they show how you can make a zvol and put ext2 on it, which is a pretty cool step towards having reliable data on linux. Too bad about the license, but I'd certainly consider it for a home server.