Joystiq posted Nintendo points don't transfer between Wii, DSi which included the following image:
Joystiq credits Siliconera with the original report, which credits Nintendo with the image. Turns out it comes from Nintendo's Fall 2008 Conference Keynote Presentation, which you can watch from Nintendo's japanese site.
Can't wait for Nintendo to innovate more on points schemes and lock them to a console per month, or they evaporate in a puff of smoke.