This is a very good source.
http://www.podcastellano.com/directorio-de-podcasts
You can surf this website: http://redgeomatica.rediris.es/elenza/index.html and you will find some audio files in the section Audio (http://redgeomatica.rediris.es/elenza/materiales/audio/index.html). You can also read the tapescript or the instructions in the PDF file provided with the MP3. Unfortunately the varieties are often Spanish from Spain (español peninsular).
Enjoy the audios!
Saludos
Gracias!
Just what I was looking for. Although I practice Castellano as opposed to peninsilar(sp?) both sources are very useful. :)