Roger Clemens goes on trial today to testify that he did not lie to a congressional committee about taking PEDS, specifically HGH or steroids. His trainer, Brian McNamee told a different story, one of supplying Clemens with steroids for years. And since there's not much else to keep people's interest in sports right now (woman's WOrld Cup, anyone?) it's the dominating story in today's news cycle. Here are a few people to watch as this trial unfolds: