[SlantNGo]

That's what I was wondering... I discussed it with a friend, and he thought maybe you were talking only about the case where you have suited hole cards and one of your suit appears on the flop.

I think that in the case where two of your suit appear on the flop, if you hold the nut or 2nd nut backdoor flush draw, that we should still count those as outs, however, certainly not as much as for a nut or 2nd nut draw where you have suited hole cards. I'm gonna take a stab and estimate that they are worth about 1 out.