gistfile1.txt

require 'nokogiri'
require 'open-uri'

url   = "http://www.london2012.com/medals/medal-count/index.html"
table = Nokogiri::HTML(open(url)).at_css("table.overall_medals")
rows  = table.css('tbody tr')
data  = rows.map { |row|
  # …get data from the row…
}