I'm a bit late posting this (I believe it's already made it to Slashdot), but Michael Stutz recently published a good article on the IBM developerWorks site entitled, "Learn 10 good UNIX usage habits." From the introduction:
When you use a system often, you tend to fall into set usage patterns. Sometimes, you do not start the habit of doing things in the best possible way. Sometimes, you even pick up bad practices that lead to clutter and clumsiness. One of the best ways to correct such inadequacies is to conscientiously pick up good habits that counteract them. This article suggests 10 UNIX command-line habits worth picking up -- good habits that help you break many common usage foibles and make you more productive at the command line in the process. Each habit is described in more detail following the list of good habits.
It contains some very useful tips. I recommend that anyone using a CLI environment, regardless of your experience level, give it a read.