I found the following code in this site's HTML
<embed src="srsmith_cat_2010.swf" quality="high" bgcolor="#7c7c7c" width="850" height="650" name="srsmith_cat_2010" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
Apparently, the whole page is designed by Flash. Then re-insert by <embed code. I'm not good at this, you may keep tracking and find what you want.
Check this thread: http://forums.adobe.com/thread/744957?tstart=0
It could have been created entirely in Flash using something like the code in the above links. If you start with PDFs these could be imported into the Flash file, or loaded dynamically at runtime.
InDesign CS4 (and CS5, I presume) can create SWFs with the page flip transition. It may be possible to create the brochure like this and then load this SWF into the Flash site at runtime. But the zoom and navigation features make me think this wasn't the case here. I would guess that it was all done in Flash with the page content loaded at runtime.