Just like choice of song is the make or break for Idol contestants, university assignments live and die on the subject matter. Whatever you decide, choose something you're fairly confident hasn't been driven into the ground by other groups studying with you and who have preceded you. It's all about the right angles. I think fitz has thrown out a fantastic idea. You could find extensive trends relating to how today's sports has taken a leaf out of the pages of reality television by essentially "doctoring" their events to align with commercial/financial pull as fitz alluded to.
Two other thoughts off the top of my head:
1. An investigation of how social networking sites (like Facebook, Twitter and Myspace) have influenced the practice of traditional sports journalism/beat writing by enabling sports personnel to cut out the traditional middle man (reporters) by providing sports stars with a platform to communicate directly with their fans, potentially minimising reporters influence/importance to near-redundance. Is it really all that inconceivable to believe that sports reporters won't exist in 2020 because social networking sites will be the dominant force in ten years?
2. An investigation into how many of today's high-profile sports stars have become "slaves". Not in the traditional sense, of course (most of today's top sports earners are not on "slave wages" after all), but slaves of a different sense - cultural slaves. For example, I do not know how much money Michael Clarke earned last year. However, I do know that it's not enough for me to want his life, were I given the opportunity to have it, because he -- in a strange sense -- has become a cultural slave by surrendering his privacy and integrity in exchange for huge sums of money and publicity.
Just blurbing off the top of my head...:borat