Pedometers connected to video-games are more and more complex, as attested by this Pokéwalker, a Poké Ball-shaped pedometer which can connect to Pokémon HeartGold and SoulSilver game cards via infrared signals. See the possibilities:

"It uses a currency known as "watts", which are obtained as the player walks with the device. Every 20 steps will earn the player one watt. It can communicate with other Pokéwalkers. Exchanges are not limited merely to watts, but also items and Pokémon

When players transfer a Pokémon from their game into their Pokéwalker, they can select which route they would like to take their Pokémon along. Depending on which route the player takes (such as in a grassland or by the sea), they will encounter different wild Pokémon and items. When players first begin their journeys with the Pokéwalker, the list of routes they can select from is short. But, the more players take a stroll with their Pokémon, the more routes will appear and the more Pokémon and items they will be able to get.

And you can get a more in-depth perspective in Katie Salen's article Pokéwalkers, Mafia Dons, and Football Fans: Play Mobile with Me. Why do I blog this? documenting material about tracking technologies and how game mechanics could lead to peculiar usage of such platforms.