Seems like a good atmosphere - lively but not hostile. http://news.boxrec.com/news/2011/sergio-martinez-v-darren-barker-weigh-video Got to say, he looks like one big hombre, Senor Martinez.
Do these guys have like short reaches, arms look thick and short? Just an observation. Matinez looks in great shape. I think he will be too good and crafty for Barker. He may even be able to walk through Barker. Martinez seems to be a bit of a puncher now.
Martinez has always had decent pop in his shots. IMO it was because he wasn't really setting his feet before. Now he's older, he tends to move less and get leverage on his punches when he throws.