There is not that much english information available on the net until now. Cartagena just recently has become an international tourist destination. A good source is always Wikipedia: http://en.wikipedia.org/wiki/Cartagen...

 A new and very good English source about what´s going on in Cartagena, where to stay, eat, about nightlife, culture etc is http://www.ticartagena.com/

A local webpage in English with news, stories, images and maps is www.caribenet.com , including a live webcam.