Question: Is there any way to transfer DSi and WiiWare games?

dsiware wiiware transfersGood day, clever, handsome and intelligent Infendo readers. Is there anyway DSi and Wii owners can transfer their downloaded games to a newly purchased system? Could be by legal means or a work around’whatever. For any recent XL upgraders (or anyone who’s had to switch Wiis), what does the existing knowledge base say?