- Drop the shiny, translucent Aqua-wanna-be thing. Windows should look serious, a la NT 3.51/Win2K. It's been downhill since then. If you want to copy someone, take some style hints from NeXTStep, or these guys: http://www.ableton.com/live-session-view.

- Hard deprecate the backslash. Forward slashes have been OK in code since forever. The GUI should display & accept slashes.

- Incorporate bundles into Explorer & the Windows loader (again, like NeXT). This would eliminate thousands of brittle file references in the reg db.