Reality check needed here!!
Seems everyone is jumping to some conclusions based on a single term "Wi-Fi". This is a MARKETING TERM...and it DOES NOT imply the DS is compatible with 802.1x wireless networking!
The Ninentendo DS wireless connectivity is prorietary, and more like bluetooth. Let me quote straight from the Nintendo website "The wireless range can be an incredible 30 to 100 feet and for some games". This is obviously NOT 802.1x wi-fi.
Now lets re-read the announcement: "Nintendo DS users will be able to connect to the service wirelessly at universal Wi-Fi hot spots". What this means is that they are rolling out DS wireless connectivity hubs in national wi-fi locations to allow users to be hooked up to the internet away from their homes. You can probably buy one of these hubs for home too, but you are limited to the 30-100 feet as above.
Don't get me wrong, this is still good news, but its not global connectivity at any Wi-Fi hotspot.