im crew for EZY, the exits to be used for ditching and also shown on the safety card are the forward main doors and the overwing exits as pointed out the boeing 737 type are tail heavy so more of a chance to be submerged!
That has changed, our safety cards are now version 4 distributed on 02/05/2009 with the revised exits on ditching, origionally had all 4 main doors plus the overwings!
phil