RailsCast's Crawler - RubyScript

First of all thanks to RyanBates for his valuable contribution towards the rails community with those short and easy-to-understand railscast videos. From Past few months I continuously watching those videos. Yesterday while downloading one of those videos, I realize rather than downloading them when its needed, it would be better to write some short script which will do that for me. After looking for some already existing ruby scripts on internet, I ended up writing my own.

require 'rubygems'
require 'hpricot'
require 'open-uri'
class GetRailsCasts
  def initialize
    @host = "http://railscasts.com/episodes/"
  end
  def start
    1.upto(229){ |eps|
      eps_doc = Hpricot(open("#{@host}#{eps}")) rescue nil
      if eps_doc
        # cd to the folder where u want to store the rails-cast videos
        `cd /Users/sandy/railscasts; wget #{(eps_doc/".download/a").first[:href]}`
      end
    }
  end
end

Comment are most welcome