comparisons

bell.k     http://inferno.bell-labs.com/cm/cs/who/bwk/interps/pap.html
comp.k     http://shootout.alioth.debian.org

examples

cs50.k     http://www.cs50.net/psets harvard cs course
game.k     knight's tour(depth) sudoku(breadth) ..
greplin.k  http://challenge.greplin.com/ programming challenge