Heres a couple: http://www.physics.uq.edu.au/people/foster/postscript.html http://www.physics.uq.edu.au/people/foster/postscript.html http://tog.acm.org/resour

Heres a couple: http://www.physics.uq.edu.au/people/foster/postscript.html http://www.physics.uq.edu.au/people/foster/postscript.html http://tog.acm.org/resources/RTNews/html/rtnv6n2.html http://tog.acm.org/resources/RTNews/html/rtnv6n2.html