I wanted to get started with the smart client software factory so I downloaded the installer and tried to install it. It turns out you need to install the GAX (Guidence Automation Extensions) first.
The version of the GAX installer I downloaded was the Feb 2007 CTP. Then I installed the smart client software factory June 2006. It turns out you can't install it until you have both the Composite UI Application block and the enterprise library installed.
Ok, so back to downloading again. Got hold of the enterprise library 3.0 Arpil 2007 and the Composite UI application block. The enterprise library took longer than I would have expected to install, but anyway, here we go again! Third time lucky on installing the smart client factory.
Or, it probably would have been easier if I'd just read this in the first place, but hey, you got to live a little :)