sswc.rb

require 'rubygems'
require 'open-uri'
require 'nokogiri'

URL = 'http://simplesignup.se/private_event/2905/2dbaa69f97'

while true
  body = Nokogiri::HTML(open(URL).read)

  if body.css('select').size > 0
    system 'growlnotify -s -w -t "SSWC Tickets Available!" -m "Come get some!"'
    break
  else
    sleep 10
  end
end