LinuxBSDos.com posted a guide about installing Ubuntu 11.04 on a btrfs file system
The default journaling file system on non-boot partitions on Ubuntu 11.04 is ext4. Other journaling file systems supported are ext3, xfs, jfs, reiserfs, and btrfs. The journaling file system of interest in this article is btrfs, the B-Tree File System. Btrfs is an ongoing attempt to create a ZFS-like file system for Linux.How to install Ubuntu 11.04 on a btrfs file system
