get_tweets.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'open-uri'
require 'simple-rss'

if ARGV[0].nil?
  puts "Provide a Twitter screen name"; exit;
else
  screen_name = ARGV[0]
end

file = screen_name+'_tweets.txt'

fh = File.open(file, "w")

url = "http://twitter.com/statuses/user_timeline.atom?"+
      "screen_name=#{screen_name}&count=200&page="

iterator = 1
brake = false

while true

  rss = SimpleRSS.parse open( url + iterator.to_s )

  rss.channel.items.each do |item|
    fh.write item.title + "\n"
  end

  iterator + 1

  if ( rss.channel.items.count < 200 ) then break end

end

fh.close

puts "Wrote as many tweets as I could to #{file}.\n"

if (! File.size?(file) ) then File.delete(file) end