A while back I created the Why Ruby repository on RubyForge as a place 
to collect Ruby Presentations that are freely available to those who are 
trying to answer the question "Why Ruby?" to their colleagues and 
associates.

Jim Weirich just contributed his excellent presentation of OSCON 2005 
titled "10 Things Every Java Programmer Should Know About Ruby". You can 
download it from here:

   http://rubyforge.org/docman/?group_id=251

and the home page for Why Ruby is:

   http://whyruby.rubyforge.org/

Curt