That's excellent. A nice variation around this that I've been keen on for a long time and have been wanting to see in modern IDEs is using 3D (or drop shadows)

That's excellent. A nice variation around this that I've been keen on for a long time and have been wanting to see in modern IDEs is using 3D (or drop shadows) to simulate the nesting of blocks/closures/scopes and give the programmer an instant understanding of the different levels and depths.