I'll just quote Wikipedia here <a class="postlink" href="http://bofh.ntk.net/BOFH/index.php" onclick="window.open(this.href);return false;">http://bofh.ntk.net/BOFH/index.php</a> Take a look at, for example, chapter 12 for a start.
Haha, that site is great, Kittens: <a class="postlink" href="http://www.theregister.co.uk/2010/11/26/ventblockers_2/" onclick="window.open(this.href);return false;">http://www.theregister.co.uk/2010/11/26/ventblockers_2/</a> Uh, yea, a word of warning, don't go further than page 8 if you're not too fond of insects. Also, the last page, ugh.