Scott Jensen posted an image of what he believes iTunes 10 could have been if Apple spent more time focusing on usability instead of making iTunes totally different than all other Mac OS X apps. I much prefer his version than the one Apple made available for download on Wednesday.
But I still hate how the expand/close/minimize buttons are lined up vertically. It makes no sense compared to all of Mac OS X’s other windows.

You can fix the terrible buttons with this terminal command:
defaults write com.apple.iTunes full-window -1
just quit itunes before you do it and when you relaunch it the buttons will be back to their normal selves.
here is the terminal command i used in case the other doesn’t:
defaults write com.apple.iTunes full-window -boolean YES