*Fix the "Connect to Server..." back to how it was in Jaguar and fix the network browsing to work much much faster. It's rediculously slow even with a few computers and workgroups and unreliable to boot.
*Remove "File>Duplicate" and replace it with "File>Cut" so that you can actually MOVE a file without 1)having to drag and hold through a million sub folders or Copy & Paste and go back and delete the old file. Who needs duplicate when you can Copy&Paste just as fast?
*Fix the printings... in every web browser on the system, Aqua controls get screwed up when printing or saving as a PDF (essentially the same thing).
*Add a menu to the Apple menu or such that would give you fast access to your programs. I still find that I work slower on my Mac than my PC where I would rather see it the other way around.
*Built-in email checker? So you wouldn't have to have Mail (or another app) running and sucking your memory.
*Better native support for PC mice with multi-buttons.
*A way to change the function key settings on powerbooks to be the other way around so you don't have to use FN to access your F# keys. (How dumb is that! Who designed this thing?)
*True CDRW support.
*A way to show hidden non-system files (like Windows, sorry) or both system and non-system files, depending on what you want to see in the Finder.
Is my list long enough?
A lot of little Apple quirks that haven't changed since my System 7 days that still turn up once in a while. I'm sure I'll think of more stuff later. It'd be nice if Apple did read these.