What type of diversity really help organizations?

Interestingly enough, many organizations now have diversity programs and many report numbers to showcase their success. However, most of the diversity programs deal with gender, race, skin color, and sometimes sexual preferences. That could be helpful as long as folks bring about differences in core culture, value and opinions. It is natural for anyone to hire people that are similar to their own way of life. We will travel the world to find talent, and ultimately end up hiring people with similar values and culture. Diversity program should include broader set of guidelines in employee selection and we are starting to see that in some organizations. I would welcome discussions around this topic as I believe diversity of thought is more critical to organizations success than other measures.