History of Programming Languages

I saw this on someone's wall a while ago but just now ran across it on the web.  This is a chart of all major programming languages, how they are related, and what years they were around.  It's an interesting view of where we have come from.  Two of the first 4 languages (Fortran, Lisp, B-O, and IAL) are still in use today in one fashion or another.  I find it intriguing to look at the ancestors of many of our modern languages.