What feature do you most want to see built into OS X?

I wuld like to see the finder replaced. Gone are the days of organising oursleves our folders and file names. The system should do this.

What we need is a central repository or Library, in which we put classified items by eg by Title, Subject, Author, key words, etc. Classifications should be able to be created by users, but the OS should come with a typical menu tree of Subjects. Users should not Save from any application, but Check-in to the Library.

Library subjects should be able to be shared - just like sharing iTunes or iPhoto.

I would like to see two mouse buttons on portables also...

Those of you choosing "Exchange compatible ‘all in one’ PIM app" should read the article here: http://babygotmac.com/a/133