I'm not actually an ork player, but I can hardly believe that this thread hasn't been created yet so I'm starting one.
I find the new ork flyers very interesting and I'd like to hear what ork players think of them (with respect to tactics). I could take the lack of thread to mean that so far no-one cares for them enough to bother talking about them, but these are my thoughts.
(Hopefully 6th Ed is as close as we'd like, and we'll be able to see how these units were meant to function, but that doesn't stop us enjoying the potential uses until then.)
Dakkajet (correct me if i got the name wrong): seems ok for the price. good if you can get side armor. the extra set of supershootas seems like its always worth taking and the upgrade to become a fighter ace should be points well spent if flyers become more popular or against DE. It's not as good at doing this job as Lootas, which could be the main disadvantage, but doesn't use up a heavy support slot.
Burna Bomber: excellent alpha strike unit if given the full compliment of skorcha missiles, but then the price starts to look quite steep. these should fill the same role as DE razorwings, coming in from reserve to wipe out a diss-embarked squad. if you get lucky you could even drop a bomb the same turn on an enemy outflanker who strayed too close to your board edge. to me the main weakness of this unit is that it doesn't look too useful after it's dropped it's payload, which it will do pretty quickly because it won't survive long while it's still a threat.
Blitza-bomber: i don't really like this one. the main bombs don't sound amazingly effective even when they do work and you only get two shots, though the delivery system is suitably orky. Seems more like a unit you use for fun than tactical advantage. maybe I'm just not thinking about this the right way.