DWL- bleeding your speed on an uphill, gaining it back on the downhill. Without fuel consumption display, you just keep the pedal pressure constant. With a FCD, its slightly more complicated, but just keep the first part in mind.
DWB- self explanatory. Drive if your brakes are not working. In other words, look far ahead, and prepare for the traffic situation ahead. (also see Anticipatory Focus).
NICE-ON: put the car in neutral, with the ICE on. It is especially useful when there is a downhill, there are no obstacles ahead, and you want to mainain/gain speed.