1. I want location specific System Preferences. For example, if I connect to my network at work, I want OS X to automatically mount various shared volumes, change my screensaver, automatically set the default printer. If I close my Powerbook and open it again at home, these settings should change once it connects to my home network.
2. Improved icon previews would be nice. Sometimes I would prefer to see a Word file, for example, as an icon preview.
3. Increased use of album art (i.e. on album folders as windows does or on the desktop as itunes is playing) might be nice. Hardly imperative, though.
How Could OS X Be Improved?