I've had this mapped for years and it's very convenient. Now I find after installing Natty even though it's still defined in keyboard shortcuts, the key bindings don't work anymore as the unity bar seems to steal it. Any ideas?
You can reassign the "Super" key that does the launcher key to another key such as Alt. When you do this the "Super" reverts back to whatever your keyboard short-cuts is defined.
Alt + F2
click on the gconf-editor icon revealed in the dash
change the value from to whatever key you wish to reveal the launcher