Spanish language

So was browsing the Creative Commons Deed link and saw a reference to Castellano. Now the one thing that I have to confess to is that I'm a language fiend. It's partly cause I'm a cryptography fiend and also an anthropology geek. Nothing is more exciting than uncovering information held in a different form, I guess. Anyways I see a reference to Castellano, and I well click on it, never having heard of this term. Turns out it that it's a formal version of Spanish. I now refer you to the excellent Wikipedia article Names given to the Spanish language.