I had been monitoring this dilemma whilst it was developing but it seems now that a decision has been reached.

Bangkok will shortly have 2 international airports.... yes, they are re-opening Don Muang to International flights.

This is all due to the deterioration or runway/taxiways at Suvannabhumi (nicknamed Swampyboom) and most recently damaged airbridges resulting in long delays and flights being diverted.

http://www.nationmultimedia.com/2007/02/06/headlines/headlines_30026114.php

Apparently Don Muang will be open within 45 days.

Pesonally it means little difference to me apart from an extra 200 baht or so in the limo.

It isn't clear which airlines will transfer back to Don Muang.... I'll keep my eyes open.