I wrote an article on the origins and design of btrfs, which, because I was too busy with OSCON to post about it last week, is at this very moment available free to all:
I originally intended for it to be an overview of btrfs from the user/administrator point of view, but it morphed into this weird present tense gonzo journalism pseudo-documentary. Kinda weird, but people seem to like it, and I didn’t want to claw my eyes out while writing it.
In the article, I briefly compare and contrast btrfs and ZFS architectures. After you read this, you should be able to explain the basic differences between ZFS and btrfs in 60 seconds or less while twirling your glass of champagne. The other web 2.0 nerds will be TOTALLY IMPRESSED. I swear.