Power Supply roundup

I've been sat in my home office at the keyboard for the last hour now, figuring out how to start this article. The sheer scope of the copy I've got to write, encompassing testing and analysis of 34 - yes, thirty four - power supplies, means that I'll struggle to write the main sections, never mind this introduction. So I've been thinking about why the testing came about in the first place. If you want to write a decent intro, you start at the beginning I guess!