Here's the Wikipedia definition of "La Llorona".

Listen to a short National Public Radio feature about a folk song entitled "La Llorona". The northern New Mexico musician performing the song provides an excellent explanation of the legend.

Filmmaker Bernadine Santistevan is working on a film called The Cry, an urban thriller based on the La Llorona legend. Included on her website is a blog about the film that also includes La Llorona sightings and various ruminations on the legendary figure.

"Got milk?" La Llorona was featured in a California Milk Advisory Board television ad in 2002! Read a tidbit on this cross-cultural tactic to bring dairy to the masses...