I wanted to get an early bird reward for a Kickstarter project, and sometimes people abandon them to switch tiers or un-pledge, so I slapped some code together using Typhoeus, Nokogiri, and Twilio to retrieve the Kickstarter page, grab the relevant reward

gistfile1.rb

# coding: utf-8
require 'rubygems'
require 'twilio-ruby'

require 'nokogiri'
require 'typhoeus'

# Setup Request
url = "http://www.kickstarter.com/projects/martinkallstrom/memoto-lifelogging-camera"
selector = "#what-you-get li:nth-child(4)"
current_text = "\nPledge $199 or more\n\n\n\n\n1000 backers\n\n\nSold out\n\n\n\n\nEARLY BIRD SPECIAL • At $80 off of list price, be the first to get a Memoto camera in your choice of color. Choose between Arctic White, Graphite Gray and Memoto Orange PLUS get featured on the list of Memoto Friends at memoto.com.\n\n\nEstimated delivery:\nFeb 2013\n\n\n\n\n"

loop do
  http = Typhoeus::Request.get(url)
  doc = Nokogiri::HTML.parse(http.body)
  text = doc.css(selector).first.text

  if text != current_text
    # Setup Twilio
    account_sid = "..."
    auth_token = "..."
    client = Twilio::REST::Client.new account_sid, auth_token
     from = "+1 1111111111" # Your Twilio number

    client.account.sms.messages.create(
      :from => from,
      :to => "+1 1111111111",
      :body => "Memoto page changed! #{url}"
    )
    puts "Sent message!"

    raise StopIteration
  else
    puts "Same content; sleeping for 10 seconds"
    sleep 10
  end
end