In the run up to launch much was made of the many functions the 3DS would have, so people were disappointed to find them absent when the console finally released.
Well, this week will see Letter Box (or Swapnote in the US) hit the 3DS. This system will allow owners to send and receive messages, 2D/3D pictures, photos and sounds via StreetPass or SpotPass.
“Your Mario Kart times sux, LOL”.
Source: Press Release