I'm pleased to announce a cool mapping application I hacked together this weekend which lets you see on a map where each National Team's player's clubs are located.  At the moment, I've only included England, Spain, the United States, and Mexico but will be adding more teams as the World Cup approaches.

Some things you can do:

• use the Satellite view to see the stadiums for each club, some have writing on them!
• learn which teams are concentrated in their domestic league,
• and learn which teams are concentrated outside their domestic league