Yes very well describe the golden triangle and its atractions other websites worth to have a look on same theme are
http://www.golden-triangle-tours-india.com/
Yes these are top gateway for holidays in India but still other tourist places are there in north, south, west, east and central india which are major attractions for tourist like konark, mumbai, jaipur, aurangabad, ranthambore, periyar, kerala, goa, chennai, puri, etc.