With night error, coastal refraction, turn error and the tendancy to point at the nearest thunderstorm, it's amazing that the NDB is still in existance. It appeared in the 1920s - imagine introducing and trying to get it certified now!It may be of some comfort to the GA flyer, but most GPS sets will give bearing and distance to a waypoint - so why not use that!
In the USA, nearly all NDBs have gone - I can't think of any off hand. Where I fly now (China), there are quite a few still around. This is historic and they are gradually disappearing. However, when we use them as a navaid, we will always have GPS as our primary navaid, so we are just referring to the position and not the NDB itself. And if we have to fly an NDB approach, it is essentially a GPS approach.
As part of the IR I used to fly on a Classic 747 (only two years ago), we had to fly an NDB approach. If faced with that situaion for real with weather on minimums, I don't think many of us would have not first considered flying to the alternate. In fact, our chief pilot hinted that he didn't want anyone doing it for real.
Consol - now there's a system!