Design Patterns in Dynamically-Typed Languages

[Andrei Alexandrescu]

There's been quite some discussion lately about dynamically-typed 
languages et al. Here's a pretty good and easy-to-follow presentation by 
Peter Norvig (AI guru among other gurusdoms he owns) on how 
dynamically-typed languages make implementation of various design 
patterns considerably easier:

http://norvig.com/design-patterns/

Andrei