I tried using the spacial feature of Nautilus, a file manager for Linux. What's your usage of a spatial file manager? I couldn't see it being beneficial to my file browsing in any way. Just curious.
Similarities between the new dock and the dock in pre-Leopard is an exception, I think. There is much more not in common design-wise than there is in common.
I like how apple is slowly reversing their design decisions. I'm keeping my fingers crossed for the return of the spatial finder ;)