The D Language
Today, as I was browsing my online book collection, I ran into a book that talked about the D language. Intrigued, I searched for this and ran into this web site: http://www.digitalmars.com/d/. There is a good example of a Hello, World reloaded and the syntax reminds me of C and C++. In fact, D is a statically typed language for systems programming.
Looking at these single letter language evolutions, I remember that In my college days, we learnt the B language was the predecessor for the C language. C was overloaded with C++ (derivations off C++ into the world of object oriented languages is a history by itself and there, I ran into a language called BOO). Now, we have D that aims at merging C and C++. I don't think we have an E language yet, but there is already F# by Microsoft Research: http://research.microsoft.com/fsharp/fsharp.aspx
Its totally cool to see this evolution and one day (possibly before my lifetime), I think we would have covered all the 26 letters of the alphabets, each, as a language.