Lisp in fewer than 200 lines of C
You could also have a look at this essay, 
<a href="http://lambdaway.free.fr/workshop/?view=lambdacode" rel="nofollow">http://lambdaway.free.fr/workshop/?view=lambdacode</a>, following Peter Norvig's lispy, written in less than 300 lines of plain Javascript and working in any web browser.<p>Your opinion is welcome. Alain Marty