FLTEACH listserv users have been sharing different websites that give examples of different Spanish-speaking accents from around the world. Here are some of the suggestions:
Catálogo de voces hispánicas from the Centro Virtual Cervantes: Links to videos of speakers from different places, with a list of characteristics of each accent: http://cvc.cervantes.es/lengua/voces_hispanicas/default.htm
The Spanish Proficiency Exercises from the University of Texas at Austin is a compilation of brief video clips in which native speakers of Spanish from various locations throughout Latin America and Spain demonstrate various language tasks: http://www.laits.utexas.edu/spe/index.html
The Spanish Audio Gazette has collections of sound files and transcripts from different Spanish dialects: http://lab.chass.utoronto.ca/rescentre/spanish
The Spark the Enthusiasm website has three useful videos: Los Acentos Hispanos (http://www.sparkenthusiasm.com/latin_american_accents.html ), Los Acentos Diferentes (http://www.sparkenthusiasm.com/accents_in_13_different_countries.html ), and a comparison of vocabulary in Mexico and Spanish (http://www.sparkenthusiasm.com/vocabulary_spain_vs_mexico.html ).