O'Reilly has created a poster showing the 50-year history of computer languages from 1954 to 2004, available as a PDF. They have also been giving away copies of the posters at O'Reilly conferences. I love the links shown where older languages split or combined to create the newer languages over time.
I look back around 1990 when I was programming in college and see Fortran V, C++ and the birth of Visual Basic. I remember having to convince my engineering professors to let me program assignments in C++ instead of Fortran.
The original diagram was created by Éric Lévénez. Although O'Reilly is not updating the poster, Eric is keeping his original diagram up to date on levenez.com.