Om -The Primordial Sound, The Eternal Syllable
There is a very nice article on the subject in a free online magazine
www.akhand-jyoti.org in spet-oct 2005 issue.
I hope you enjoy the article.
Also, if you like to know more about mantras, there is a very nice free ebook titled: The eternity of sound and Science of Mantra.
It can be downlaoded from http://www.awgp.org/english/books/books_english.html
Also please let me know if you know free online sources on similar subjects.
Vipul…