Optimal bash

http://www-128.ibm.com/developerworks/aix/library/au-satbash.html

Good command-line habits

http://www-128.ibm.com/developerworks/aix/library/au-badunixhabits.html

Remote secure filesystems

http://www.howtogeek.com/howto/ubuntu/how-to-mount-a-remote-folder-using-ssh-on-ubuntu/

MySQL cheat sheet

http://www.ilovejackdaniels.com/cheat-sheets/mysql-cheat-sheet/

Build your own router

http://techarsenal.com/content/tutorials/router_from_scratch.htm