Make an overlay for a TV viewer (e.g. for mythTV) that overwrites the annoying ticker bar in CNN (etc.) with alternative content. e.g. fact checking from politifact.com or putting stories in perspective: "although flooding in this small US town is tragic, there are currently 3000 major floods on earth affecting 160M people" etc.
Stories rotate so frequently that a small group of people could create and schedule the content. The service could even sell google adwords in the ticker.
Update: voice analysis for spotting lies would fit nicely in here too.
