login.rb

require 'rubygems'
require 'uri'
require 'net/http'
require 'net/https'
require 'hpricot'

uri = URI::parse("https://pagseguro.uol.com.br/Default.aspx")

http = Net::HTTP.new(uri.host, 443)
http.use_ssl = true


form_data  = { 'UcLogin1$Email' => 'bruno@dookie.com.br', 
               'UcLogin1$txtSenha' => '',
               '__VIEWSTATE' => '/wEPDwUJNzUzNzk0ODY1ZGRZut/ApSvnCpFqV4B1apxlo1+4GQ==',
               '__EVENTVALIDATION' => '/wEWBALgz9yPDAKMzOOSBgK18LirBgKQiaXeDUqQuH0w+ItP6BClfPJj0tH79CpX' }.map { |k,v| "#{k}=#{v}"}.join("&")

resp = http.request_post(uri.path, form_data)
puts resp.body