As far as i know the above mentioned areas are where they are concentrated. They just rented another very nice building in Najma.... and why not.... it´s close to the airport.... and logistically smart to concentrate people...don´t worry. Doha is great. But it´s not easy and full of lots to do. On the bright side... you wont get over stimulated like in dubai (which i personally call `trueman show international) Like i said.... life here is real! And you need to be a bit imaginative to get the best out of this place..get back to basics.. which is why i like the place. But then again i grew up in this part of the world so it feels like home... more than any other place.