Japanese DS owners can go to stores and download game demos and bonus content to their handhelds.
Kotaku Gaming Blog noted today that NCL has updated their Nintendo DS website with details of the new Download Service. The following content is available for wireless download at Japanese stores:
The first two are playable demos of DS games being released in Japan. The third is a set of downloadable songs for Band Bros., the music game that has been available since the Japanese DS launch.
The demos will only be available while the DS is turned on (or asleep), but the Band Bros. content can be saved permanently to the game card.
The NCL webpage lists dates from Feb. 26 (today in Japan) through March 21. No pricing information is shown, so this is probably a free service.