Encrypt your home folder (Ubuntu post-install)

http://www.makeuseof.com/tag/encrypt-home-folder-ubuntu-installation-linux/

Dropbox alternatives (Ubuntu)

http://www.junauza.com/2011/12/dropbox-alternatives-for-ubuntu.html

Check and repair MySQL tables ‘live’

http://www.thegeekstuff.com/2011/12/mysqlcheck/

Anaconda update images for CentOS

http://karuppuswamy.com/wordpress/2011/12/28/how-to-prepare-anaconda-updates-image-for-red-hat-enterprise-linux-and-fedora/

Weather and dictionary queries from the command line

http://www.techrepublic.com/blog/opensource/how-to-use-shell-functions-to-fetch-information-online/3317

rTorrent for completeists

http://fsk141.com/rtorrent-the-complete-guide

Use BrowserID with CSP

http://feeding.cloud.geek.nz/2011/11/using-browserid-and-content-security.html

Mailman and iRedmail on Debian

http://www.howtoforge.com/installing-iredmail-and-mailman-on-debian-squeeze