Here's an interesting lecture (sorry, I couldn't find a non-split version) he gave at a university in Sweden (where Erlang has a much greater influence, ahhh the sanity of Northern Europe ;P)
note - the sound is dim for the first few moments
He goes into some of the choices that went into Erlang, and some interesting experiences he had as the project went forward. He gives a different list that he feels the students in attendance should learn:
C, JS, LLVM Assembler, one of ruby or python, and one of Erlang or Haskell.