Linux Security Part 1
LinuxnewsNow.com has a new series on Linux security. This is a great read — allbeit a bit long — it includes a lot of nice information on how to secure your Linux machine.
Link: http://www.linuxnewsnow.com/index.php?option=com_k2&view=item&layout=item&id=463&Itemid=569&lang=en