I wish to press Super (or any other key combination) and start typing to launch programs. How do I do it? Thanks
Super key is the default key for opening dashboard.
You can find more help from this link
or otherwise you can use Compiz Configuration Settings Manager for changing keys
sudo apt-get install compizconfig-settings-manager
After that open dash and type ccsm, then go to unity plugin option
Change key from here.
Super is the key you press to access Dash Home.
The Super key is equivalent to the windows logo key or the ⌘ (command) key. In Ubuntu, it's just another name for the windows logo key.
You can always change mapping of such keys. In Ubuntu 12.04 you can do so from
System Settings -> Keyboard Layout -> options -> Alt/Win key behavior.