UrbanRail.net, a site collecting the metro maps all over the world.
Metros I've taken so far:
Taipei, Taiwan (wow, this site contains the detailed and future plan. Cool!)
Paris, France
New York, USA
San Franciso, USA
Newcastle, England (I miss this map a lot.)
Glasgow, Scotland
uhh... it would be nice if a world metro map of mine can be drawn like this.
