Ruby HTTP/HTML parser相关资源
Net::HTTP:
http://ruby-doc.org/stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html

Nokogiri:
http://nokogiri.org

Mechanize:
http://mechanize.rubyforge.org/

Hpricot:
http://hpricot.com

Watir:
http://watir.com/