Nintendo DS WiFi USB Connector

Nintendo of Japan held a press conference today revealing their Nintendo DS WiFi USB Connector.

DS users will be able to purchase the adapter … and simply connect it to the USB port of a broadband-enabled PC and after a click or two, the PC becomes a home wireless hotspot. Therefore this creates a gateway to the web for the Nintendo DS.

Sounds simple enough.

How many lack a wireless router and need an adapter like this?