Download railscasts.com archive

get-all-railscasts.rb

require 'rubygems'
require 'mechanize'
require 'net/http'

agent = WWW::Mechanize.new do |a|
  a.user_agent_alias = 'Mac Safari'
end

archive = agent.get("http://railscasts.com/episodes/archive")
episodes = archive.links.select do |link|
  link.uri.to_s.include? "/episodes/"
end
episodes.each do |link|
  puts link.uri
  episode = agent.get(link.uri)
  movie = episode.links.select {|link| link.uri.to_s.include? ".mov" }[0]
  `wget -q -N #{movie.uri}`
end