What's with the OMming?

The sound OM - pronounced like the 'om' in the word 'home', with the 'O' sound twice as long as the 'M' sound - is said to be the representation of the sound of the universe. In yoga philosophy OM is the past, present and future, it is in the universe, of the universe and contains the universe all at the same time. It is said that if all you ever chant is OM then you will surely attain moksha, or freedom from suffering and ignorance.