http://www.qnu.org/ The website of the GNU project, it contains manuals and downloads for lots of command-line software.
http://www.linuxdevcenter.com/linux/cmd/ A wide selection of Linux commands and explanations of what they do.
http://www.tuxfiles.org/linuxhelp/cli.html Several short command-line tutorials, courtesy of tuXfiles.
http://www.linuxcommand.org/ Describes itself as "your one-stop command line shop!" It contains a wealth of useful information about the console.
http://www.tripwire.org Information and download links for the open-source version of Tripwire.
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