Plus radio, navigation, flight, supersonic flight, space flight, sattelites, computers that break the 1 GHz clock barrier (remember that one?). I daresay everything that was invented since the Greeks owned the world.
http://en.wikipedia.org/wiki/Robert_H._Goddard#A_Method_of_R...
And yes, it was very criticized at the time but as you said, mainly by the media, as it seems. I doubt, however, that they did it without any backing.
And I was wrong about satellites, it seems. I was pretty sure that the idea of using them as communications relay was also dissed, but I couldn't find any references about it.
I can, however, give you one solid example of something that was completely discredited by the scientists, which is flight. It was widely believe at the time that no object heavier than the air could fly.