http://www.therailsway.com/2007/2/20/signout-part-2
http://darynholmes.wordpress.com/2008/05/26/beginners-tutorial-routing-in-rails-20-with-rest-part-5-of-n/
http://svn.hamptoncatlin.com/make_resourceful/tags/make_resourceful/lib/resourceful/
http://wiki.rubyonrails.com/rails/pages/HowTosPlugins
http://github.com/madrobby/scriptaculous/wikis/effect-multiple
http://www.akitaonrails.com/2008/5/25/rolling-with-rails-2-1-the-first-full-tutorial-part-1
http://blog.layer2.org/2007/11/19/rails-attachment_fu-thumbnail_class-and-you/

http://phrogz.net/CSS/vertical-align/index.html

DB relationship:
http://wiki.rubyonrails.org/howtos/db-relationships/basic?s[]=has&s[]=belongs
http://apidock.com/rails/ActiveRecord/Associations/ClassMethods/has_and_belongs_to_many