Why google sucks

Ideas are like Reese's peanut butter cups... they are all the synthesis of other concepts in new combinations. Creative energy is the exploration of new combinations to yield new and interesting combinations, some of which turn out to have value. Ideas are all a synthesis of *more than one* pre-existing concept. Thus any catalog of ideas necessarily will have all of the component ideas cataloged so that you can search for combinations of ideas...   a single heirarchy will fail miserably at this task. Tags with a folksonomy have a much, MUCH better chance of yielding positive results, and being a better tool.