official wed site
http://www.citiesxl.com/
Informations for all new Beta testers
http://www.citiesxl.com/index.php?/content/view/90/63/lang,en/
New Cities XL Beta keys distribution
http://www.citiesxl.com/index.php?/content/view/89/63/lang,en/
Videos:
http://www.youtube.com/watch?v=xxHXrYDbaxY
http://www.youtube.com/watch?v=FoAWNXcS03c&feature=related