•A gameshark/pro-action replay homebrew (Load it up, input cheats, load game.)
•Homebrew games that can be played with friends without homebrew enabling devices via download play.
•Cosmetically appealing Email client (At least compatible with Gmail)
•Fully functional web browser
•Skype port/Voicechat program
•A DS MMORPG (That incorporates the touch screen, of course)
*Fully online games (With a directory to find other player, like battlenet.)