Hi fullforward,
The money deal for captains is very good. You'll find that rents are very high, around USD$2700 per month for a 4 bedroom independent villa. I have been told prices will drop considerably after the 2006 Asian games and then will be a good time to buy.
As far as schooling there are a number of international schools and the standard of education is very good.
There has been a lot of bad press about Qatar Airways, especially on this forum, some of it is true and some not. Basically if you are married with kids and your family like the idea of living in a cosmopolitan environment, you will enjoy it. If you are single or have difficulty accepting other peoples differences, then stay away.
The company is going through some growing pains, but things are gradually improving and Qatar Airways will probably be taking the lead as the best airline in the Arabian Gulf.
The best thing you can do is speak to people that actually work for the airline and when you fly over for n interview take your family with you and make sure you spend a few days in Doha, as sometimes interviews are in Dubai.
Good luck with your research!