If you were wondering about Nintendo's DSiWare download store in the US, it will be available when the DSi hits retail on April 5, with games available for either free, 200, 500 or 800+ points.
Much like Wii points, 100 DSiWare points will equal one US dollar. The downloadable apps will include titles such as WarioWare Snapped, which uses the camera to carry out the mini-games, and Code 10, a Sudoku-like number game. Prices have yet to be revealed for these games specifically, but they will fall within the $0-$8+ range. [Nintendo DSi]