My take on the list would be to merge LISP with the other functional languages (even though I realize LISP in not a pure functional language, but then neither is Erlang, OCaml, ML, or Scala), and add a list of prototype-based language, like JavaScript, ActionScript, and Io. However, I do recognize LISP's significant cultural impact on hacker culture, so I'm torn about not requiring it.

Cool list, though. Will probably inspire me to go back and try to further my understanding of Haskell, which hands down has had the most disproportionate effect on my understanding of programming.