I remember seeing that someone had hacked the drivers for a certain wireless chipset to support a DS connection...but unfortunately I don't remember the link. It might have been on a DS homebrew site.

May 23, 2007- Laguna Hills, Calif. - Game Almighty announced today a new, unique feature that allows gamers to swap Friend Codes for Nintendo DS online games through its social networking community, ...

Nintendo has unveiled the new Wi-Fi USB connector that will allow DS owners to take their handheld online if they don't already have a wireless Internet connection. The USB connector will go on sale ...