http://weblog.topopardo.com/archives/000115.html  using sysrq calls, if supported by the kernel, we can reboot, shutdown or keep working lossing the minimum amount…
http://servers.linux.com/article.pl?sid=06/08/21/1558230&from=rss step by step guide
http://flurdy.com/docs/postfix/ step by step guide to install Postfix Ubuntu + Postfix + Courier IMAP + MySQL + Amavisd-new + SpamAssassin…
http://www.howtoforge.com/perfect_xen_setup_debian_ubuntu
http://www.wikistc.org/wiki/Main_Page a free repository of knowledge in Subversive Technologies & Countermeasures
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