I am sure many of you have heard about it, however here is how it is. Just drag and drop a few application icons to your Windows quick launch bar.
Now press [Windows] key and an appropriate number on your keyboard to launch a program. For example, if you want to launch the first program shown on your quick launch bar, press [Windows] and  keys simultaneously.
If the application is in the 5th position press [Windows] +  and so on. However, you can launch only 10 programs (0 – 9) in this way.