# of notifications in menu bar icon
This should have been an obvious one for a Mac developer.. Almost every app designed for OS X has some sort of "Notifications count" which can be easily viewed without having to open the app..
Think like an iPhone, how you can see the # of missed calls, text messages, emails, etc, etc, you have, without needing to open the app itself.. I don't use the "Dock" function at all, so a menu-bar notification ticker would be great!