I don't know what happened to the sales graphs, but they are now semi broken.
http://www.vgchartz.com/swlaunch.php?game1=Wii%20Sports%20Resort%20-%20Wii
that is the link from the game page, but the graph now wants the game ID number tacked in the end within [####]. We really shouldn't need the game ID in the text fields, as I should be able to just type the name out + "- " and not have to use the auto-complete.