Moose At Play released an update to their Laser Hockey game.

Changes:

First DS-DS WiFi communication
Moved paddle visibility flag into sprite for WiFi transfer
Paddles can send their position
Host must press Start to begin multiplayer game
Ball position is now sent over from host
Host will do all the game play processing
Fixed paddle and ball positioning across wireless
Pressing start will exit Practice…correctly
Any player pressing start will exit multiplayer
Cleaning up after each screen
Sending score over
Added “Press Start” message for Host, “Waiting” message for Player 2

http://moose-at-play.blogspot.com/2008/03/laser-hockey-ds-march-2008.html