Most of the roughly 250 lawyers assembled in the Wyndham Philadelphia hotel ballroom listened intently Thursday as fellow attorney Barry Hill showed off an extensive collection of trinkets and product samples emblazoned with the logo of the now-withdrawn drug Vioxx. "Maybe you can use them (the samples) as evidence," joked Hill, a Wheeling, W.V., trial lawyer who bears a resemblance to the actor William Holden. The remark elicited chuckles from an audience that has to be one of Vioxx manufacturer Merck & Co.'s worst nightmares: a roomful of litigators who are suing or plan to sue the drugmaker that pulled...