Learn more about the traditions of El Dia de los Muertos at the Mexweb site, The FolkArt & Craft Exchange site, the MATC Latino Students' site, or the Day of the Dead site from holidays.com.
For information about how El Dia de los Muertos is celebrated in Guatemala, see the Modern Maya of Todo Santos Cuchumatanes, Guatemala page at the University of Texas. To see how El Dia de Los Muertos is celebrated in Southern California, see the Boeckman Center's site. For a general commentary on celebrations of the fiesta in the United States, see the article by John Rosales at LatinoLink.
The Day of the Dead page, from Northern Arizona University's Elementary Spanish website, includes lots of cool stuff for kids and others. There, you can learn how to make pan de muertos to eat, calacas (or skeletons) to play with, a poem about calaveras (skulls) to read, and you can learn about the ofrendas (offerings) to the dead on altars.
At the LatinoLink page, you can see the way some people celebrated el dia de los muertos in 1995 in San Francisco, including building un altár for Selena and leading a procession.
Edna Lopez tells about her experiences with the festival in Texas in an article in South Texas Entertainment Magazine.
Kearl's Death Index, a pretty interesting site in its own right, has an examination of cross-cultural perspectives on death.
And while you're at it, why not remind yourself of your own mortality with the Death Clock?
Ricardo J. Salvador, an Agronomy Professor at Iowa State University of Science and Technology has some great information about Mexico, harvest festivals and the context and celebration of el dia de los muertos. It's part of his amazing overview of Mexican and Mexican-American culture, with discussions of types of pendejos, industrial tortillas, and other cool stuff.
The University of Southern California's Library Boeckmann Center's Day of the Dead Index gives links to a huge variety of sites, including some personal reflections on Day of the Dead and resources on doing research about the topic.
Un sito sobre El dia de los muertos hecho por alguien de La Universidad de Guadalajara, y otro desde Méjico. Lo mejór es una página sobre dichos y refranes populares en Méjico sobre la tema del muerto.
The Chicano Studies Department at UCLA has put together a reference page for Mexican and Latino folklore and traditions, with a healthy helping of stuff about El Dia de Los Muertos, as well as other neat stuff like the game lotería.
Click here to hear some Dia de Los Muertos music (a performance at Hotel Camino Real - 457K .au file), courtesy of NPR's "Halloween & Day of the Dead: An Autumn Treat", where there are more photos and audio files.