PORN ALL THE TIME!

http://www.tldp.org/guides.html
Of particular use to beginners:
Bash Guide for Beginners
Introduction to Linux - A Hands on Guide
GNU/Linux Command-Line Tools Summary
Linux Dictionary
Linux Filesystem Hierarchy

http://fosswire.com/post/2007/08/unixlinux-command-cheat-sheet/
http://www.pixelbeat.org/cmdline.html
http://en.flossmanuals.net/command-line/

http://www.techrepublic.com/blog/10things/10-linux-replacements-for-itunes/450