linux kernel in a nutshell
Download the ebook
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Unlimited online free storage
http://www.divshare.com/
The 46 best-ever freeware utilities
http://www.techsupportalert.com/best_46_free_utilities.htm
scripts for nautilus
actions to add to contextual menu in nautilus .. http://www.javielinux.com/programacion_nautilus.php
12 ruby on rails tutorials
http://www.digitalmediaminute.com/article/1816/top-ruby-on-rails-tutorials
About sql injections
Types, detection , solutions.. http://www.hiveminds.co.uk/node/3104/