In addition to a slimmer design and moderately larger screens, the Nintendo DSi boasts three new features that are unique to the system and ready to enjoy upon purchase: 
 

Nintendo DSi Shop and DSiWare
The Nintendo DSiWare application will populate Nintendo DSi with software that can be downloaded from the Nintendo DSi Shop using Nintendo DSi Points directly to the portable system, just as WiiWare has with Nintendo's Wii console. Nintendo DSiWare games and applications will be available at a range of values. 
 

Nintendo DSi Camera
One new feature of the slim Nintendo DSi system is its two cameras - one camera is on the external body, and the second one points at the user when the device is flipped open. It offers the first truly interactive digital camera in a video game system with 10 different interactive "lenses" that can manipulate your photos. 
 

Nintendo DSi Sound
The new Nintendo DSi Sound serves as both an interactive voice recorder and music player that allows users to play with their music while they listen to it. Users can access different audio filters or control the pitch and speed of recorded voice or music files to alter voices or change the tempo of a song. 
 

Parental Controls
The Nintendo DSi offers Parental Controls which provide a means to manage the access users have to a wide range of content. Some of the content that can be restricted includes which Nintendo DSi software can be played (based on ESRB rating), the use of the Internet Browser, the sharing of photos, and the PictoChat feature. 
 

Also, the stylus which comes with the Nintendo DSi is slightly longer than the Nintendo DS / DS Lite stylus. Either stylus can be used with either system, but the Nintendo DSi stylus will slightly extend out from a Nintendo DS or DS Lite system when placed in the stylus holder.