http://uk.gamespot.com/news/6152265.htmlPotential Wii-owners will likely be most interested in Iwata's comments on WiiConnect24, the Wii's online network. Unlike Xbox Live, which makes users download demos, WiiConnect24 will automatically deliver Wii and DS demos to any connected console--presumably at the user's discretion
"Let's say your Wii is connected to the Internet in a mode that allows activation on a 24-hour basis," explains Iwata. "This would allow Nintendo to send monthly promotional demos for the DS, during the night, to the Wii consoles in each household. Users would wake up each morning, find the LED lamp on their Wii flashing, and know that Nintendo has sent them something. They would then be able to download the promotional demo from their Wiis to their Nintendo DSes."
I quite like the idea of it automically downloading DS demos on to the Wii.