In a nutshell, the organizational tree shows all current Padres big-leaguers and key minor-leaguers (Baseball America’s Top 30 prospects, top picks in the June 2006 draft, and anyone acquired in a trade), and links each of them back to their source. A simple example would be Josh Bard, who was acquired for Doug Mirabelli, who was acquired for Mark Loretta. Others, such as the Chan Ho Park and Ryan Klesko lines, are more complicated.
He notes that there also trees available for the Twins, Yankees and Red Sox. These trees are valuable resources and it would be nice if we had one for the Tigers as well. I might try to do something like this for the Tigers during the off-season but if anyone else is interested in doing some Tiger research, feel free to steal the idea and share it with us.