xmpp4r + say

say.rb

# login to jabber/gtalk and have your computer say whatever people are saying to you

require 'rubygems'
require 'xmpp4r/client'
include Jabber

# settings
if ARGV.length != 2
  puts "Run with ./echo_thread.rb user@server/resource password"
  exit 1
end

id, pass = JID.new(ARGV[0]), ARGV[1]

cl = Client.new id
cl.connect
cl.auth pass
cl.send Presence.new
puts id.strip.to_s

mainthread = Thread.current
cl.add_message_callback do |m|
  if m.type != :error
    puts m.body
    `say "#{m.body}"`
    if m.body == 'exit'
      mainthread.wakeup
    end
  end
end

Thread.stop
cl.close