Bleh. I want SVG icons. Think, the current level of detail (well, more, considering the "infinite pixels" to play with), but infinite scalability. It could be an option for those older macs ;) but once that's done, we need the UI as SVG. Think, distortionless zooming! :D

or you could use pathfinder. This Finder replacement supports 256 icons

I think I can live with 128x128 icons. If the only thing Vista can tout is that it can render 256x256 icons, I guess they win the big prize :P