Now featuring: Good taste.
What was once the fugliest compositing app on the planet is now a joy to behold.
There are other fancy new features too, and the same speed and power that set Nuke apart from the moment it was released. But the new UI should provide a nice, smooth on-ramp for Shake users interested in giving it a go.
EDIT: Heh, no wonder I like it so much, you can't tell where this screenshot stops and my (old) blog layout starts!