One of the things I read that an oled function bar could do is have context-sensitive buttons. Like someone else said a few pages back, in apps like Final Cut Pro or Logic, Apple has keyboards made specifically for them that don't really do anything except show you the short cuts. Imagine pressing the fn key and the button changes to what it is. One of the things I don't like about using other people's macs is when they have them set up differently and don't have the function keys set as actual function keys (requiring pressing the fn key to make F1 do what F1 normally does). Being able to just look at the button and see what it's going to do is much nicer, and not gimmicky at all. It has real world uses. Being in apps like Final Cut Pro or Logic would be able to take advantage of having other functions there as well. Those are most definitely "pro" applications.