Julio Casal pointed me at the MSGuayaquil (.NET User Group in Ecuador) Silverlight video library. The videos are about several Microsoft technologies, such as ASP.NET Ajax, Silverlight, Expression and Visual Studio Team System. As an added bonus these are all in Spanish!
See the full library here: http://msguayaquil.com/videos/videos.aspx
A few of my favorites --- though my Spanish is very bad, so you can't really trust me ;-)
Preparando videos para Silverlight9 min, 34 seg / 79 Vistas
Creando una aplicación Silverlight desde cero - Parte 211 min, 49 seg / 79 Vistas
Creando una aplicación Silverlight desde cero - Parte 113 min, 50 seg / 119 Vistas
Ajaxificando un sitio ASP.NET desde cero - Parte 215 min, 21 seg / 66 Vistas
Ajaxificando un sitio ASP.NET desde cero - Parte 117 min, 01 seg / 216 Vistas