Nice List

This list is very very nice, and in fact if you use babel fish on the rest of the site it has a wealth of knowledge.

Out of the whole list here are the few things i enjoyed:

lspic -tv
lsusb -tv
Decent Coverage on the "Find" command
Mounting section is a nice quick ref.
Common Package management commands (Redhat & Debian)
File system Analysis
Swap commands
Networking section
SAMBA section
Monitoring and Debugging section

Now id like to say.. the examples they give of every command is very clean and to the point. This definately a must for a junior admin in my opinion.