i was thinking of the potential this could have in connecting with the DS earlier. if Wii had a buddy list set up and allowed for person to person messaging and/or full chatrooms, you could very well use a keyboard attached to Wii via its usb ports, or more interstingly use the DS to relay information.
say you and i wanted to chat, but i had to do things around the house and couldnt be teathered to a keyboard, i'd simply let my Wii and DS connect and now i could send and recieve messages from anywhere in my house as the DS uses the Wii as a hot spot to stay connected to wifi. yet on your end you could have some sort of option to either display my messages 'as is' or translate it into a normal text on your screen (considering you were using your tv and messaging on the wii + keyboard. the only bad thing i see about that is if i drew a picture on the ds and thru handwriting recognition, it was translated as jarbled text to you.
also, the DS could be used as a mic/speaker as well so if i did have to step out of the room and away from the wii, and assuming the wii speaker was also a mic and used as a "wii phone" voice communication would still be possible.