Good intro to the command line, but there are GUI's too
At last, a reference to Wikipedia on the register without saying wackypedia. At least one person at vulture central has seen that there are some good articles there.
By all means, introduce people who are interested in command lines to less, but consider <shift><page up>.
@CN Hill: Linux has GUI interfaces for almost everything. For some purposes, the command line is a better choice. As far as I know (I have not used MS software for about a decade) Microsoft have taken the choice away from you, so you cannot easily perform some tasks from a command line interface in Windows. Next time you are suffering from the death of a thousand mouse clicks, remember that I could accomplish the same task in seconds from the command line.
Linux forums can be unfriendly to newbies. There are several possible reasons. A small minority of penguinistas do not want a bunch of computer illiterates encouraging malware authors to target Linux. Sometimes a script kiddie is being rude to hide his ignorance or to feel superior. The most common reason is that the newbie has not demonstrated any effort to look for existing solutions. Unfortunately not all penguinistas point newbies at http://www.catb.org/~esr/faqs/smart-questions.html
If you want things to happen automatically, without having to reach all the way over to the mouse, then the command line is to first step to learning how to create scripts. Here are some resources I wish I had found when I first met the command line:
When you read the manual, it is displayed by a program called 'less'. Learn what you can do with less by typing: "man less"
The next step is to learn what you can do with the manual. Type "man man".
Command names can be a bit cryptic, but that last page should have told you the solution. Try: "man -k cifs"
The GNU project has issues with the man pages. They prefer the info pages. Type "info info" to learn how to read them. If you know vaguely what to do, but need a reminder of the details, the man pages are the best choice. If you are exploring unfamiliar territory, the info system is more useful.
Very often, newbies (and Gurus) collect together related infomation into a tutorial (a HOWTO). Check out the Linux documentation project (http://tldp.org/). Before diving into one of the documents (find the right one in http://tldp.org/HOWTO/HOWTO-INDEX/index.html), check the date. If the one you are interested in is two years old, you can safely assume that no-one has updated the HOWTO because modern software tools have made the task trial.