The lisp-way to solve Fibonnaci

Question

I wanted to try and learn Lisp, but I very quickly gave up. I figured I\'d try again. I\'m looking at Problem 2 on Project Euler - finding the sum of all even Fibonacci numbers

Answer 1

http://fare.tunes.org/files/fun/fibonacci.lisp has a walk through of solving fibonacci, gradually improving the time and memory performance of the implementation.