Many of these problems come from the press misinterpreting the results or significance of results that scientists present to them. An example would be that since scientists say global warming could cause a trend of an increase in storm systems that the press runs a headline "Did Global Warming Cause Katrina?!"; or that since scientists say red wine has antioxidant effects that all of the sudden "red wine is good for you" while failing to mention that drinking a bottle of red wine a night would probably shut your liver down permanently.
Other problems are caused by the press publicizing a finding before it has undergone significant peer review. Examples of this include the cold fusion fiasco or National Geographic magazine showing an example of a feathered dinosaur fossil that turned out to be a composite (though other such fossils have been authenticated).
Either way, you should be wary of any "sudden discovery" touted too loudly by the press. Scientists sure aren't perfect, but as most people on FR would agree, it's the media that are the real "pinheads" most of the time.