Zeta got reviewed at ZetaNews...
It seems it has quite lot of improvements over BeOS 5.1 (a devel version, final stable was 5.0) Among other things, full support for the newest hardware...
Its seems its much faster in multimedia applications and that got some real good eye-candy.
I think i'll give it a try when the final version comes out.
Link: http://zetanews.com/module.php?mod=node&id...4aef337614b18a2