Android, administracion de sistemas y seo

http://www.mandarindesign.com/opacity.html

http://www.wikistc.org/wiki/Main_Page a free repository of knowledge in Subversive Technologies & Countermeasures

http://www.gzthai.com/main/ can be downloaded from here

http://www.rubyinside.com/19-rails-tricks-most-rails-coders-dont-know-131.html

http://www.digitalmediaminute.com/article/1816/top-ruby-on-rails-tutorials

http://www.k10k.net/frames.aspx?section=patterns