I'm positive, it's in the format menu, and the btrfs module is installed by default. See: https://help.ubuntu.com/community/bt...10.10 Maverick
btrfs-tools will get pulled in on install if a btrfs partition is mounted, much the same as xfs, jfs, etc.. Never the less, about the only thing you should 'trust' btrfs with right now is an OS partition, any semi-important data should go on a dependable filesystem. And BtrFS performance on Linux 2.6.35 is pants, so you'd be as well off waiting for 11.04 anyway.