Skype for Linux can be downloaded at www.skype.com/products/skype/linux [1].
A step-by-step guide to building your own PC can be downloaded from PC Mechanic at www.pcmech.com/byopc/index.htm [2].
D-BUS is part of the Free Desktop project and can be downloaded at www.freedesktop.org/Software/dbus [3].
SkypeMate can be downloaded at www.yealink.com/skypemate/support.htm [4].
A Linux compatible Skype-to-Phone adapter can be obtained from www.echostore.com/skype-phone-adaptor-usb.html [5].
A spreadsheet, written by the author, to help you figure out your potential savings from switching to Skype for phone services is available at www.elpispublishing.com/XHTML/downloads.php [6].
Links:
[1] http://www.skype.com/products/skype/linux
[2] http://www.pcmech.com/byopc/index.htm
[3] http://www.freedesktop.org/Software/dbus
[4] http://www.yealink.com/skypemate/support.htm
[5] http://www.echostore.com/skype-phone-adaptor-usb.html
[6] http://www.elpispublishing.com/XHTML/downloads.php