Ognian "steel" Gueorguiev, of CPL and WCG fame, recently put together another of his "Steel's POV" series at the ESEA. The article, Steel's POV - Tournament Upsets Explained, takes a look at the how and why of Counter-Strike tournament upsets.
Some upsets are the thing of CS legend, launching relatively unknown players into the spotlight of top level stardom, while other upsets quickly fade into the dark recesses of the memory when the team or players fail to generate any/enough additional attention in the rest of their careers.You can read more of his POV right here.