Nice article by Scott McKinney at Royals Review. Based on the average WAR for the cost-controlled years from Baseball America's top 100 prospect lists from 1990 to 2003, he classified each prospect as a bust or a success. Towards the end, the author looks at prospect bust or success percentage by organization. The Pirates' rank next to last in success rate, which is no surprise given how few homegrown stars were developed over that time period, and how rarely the Pirates won over that time period (excluding 1990-92, of course, but then again none of the Pirates on the list from 1990-92 made a significant impact on those winning teams). The good news is that there's hope: the other three teams in the bottom four with the Pirates all went to the playoffs last year, and the organization ranked last won the World Series. (link to the BA top 100 lists)