In fantasy baseball, park effects create an additional challenge that isn't present in real-life baseball. At the major league level, while certain players will take better advantage of a particular park than other players, these effects tend to be relatively subtle. However, in most fantasy formats, when a player moves from Petco to Coors, the underlying value changes as much as the statistics do.
As most free agents are signed and most organizations fairly set, and with the fantasy draft season in full swing, this is a good time to take a look at some of the players whose value most shifted because of park changes. There will probably still be some trades in a week or two, as teams deal with players without any option years remaining, but these will likely involve lesser names.