+ Friend Codes
MapWii.com is a Google Maps mashup of worldwide Nintendo Wii numbers (a identifier unique to each Wii system). MapWii has just announced updated functionality to also include mapping of Wii Online Game Friend Codes (12 Digit Game-Specific Codes). This Mapwii forum post explains how to include online game friend codes from Mario Strikers Charged Football and Pokémon Battle Revolution into your MapWii Games List.
For more background on Wii numbers and Online Game Friend Codes, read this Wikipedia article which explains both in detail.
Wikipedia: Nintendo Wii
Find the Nintendo Wii with the Google Maps WiiSeeker