ok this is what ds lite can do with the right hardware/software

play innovative games using touch screen
microphone
brightness adjustment to save battery
surf net
msn
watch video
listen to mp3
drawing
personal pda (calender, calculator, etc.)
2 screens!
plenty of upcoming square-enix RPGs games
mario
watch TV (in japan)
there's also a hardware that detects movement, something like PS3 sixaxis or wii remote
best selling handheld in the WORLD
wi-fi multiplayer

hmmm.... what else