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This guide is quite useful, especially now that the PC-BSD project is still in its infancy.
Of course, once the number of .pbi packages grows ( http://www.pcbsd.org/packages.php ), it won't be necessary to run install scripts that leverage the FreeBSD ports, like in the case of the installations explained.
Anyway, the scripts in this guide are also a way for a beginner to come in touch with FreeBSD ports.
Even if the .pbi packages are the easiest way - and so, the most suitable to people not so interested in the "inner workings" - I think everyone who wants to become familiar with Unix will eventually start to use ports much more (PC-BSD is just a layer of user-friendliness; under the hood there's a complete FreeBSD operating system).
For that purpose the FreeBSD handbook would be, as usual, the best starting point