Architects work in imagery. They are either designing it, documenting it or photographing it. For that last one, the tool that many architects now use is their iPhone.
With the recent updates to the Apple's operating systems, iOS 8 on the iPhone and OS X 10.10 or "Yosemite" for the Mac, there are many new and or revised features that affect how architects use these tools.
Austin Mann is a professional photographer and has complied an extensive list in an article title, "Yosemite + iOS 8.1: What Photographers Need to Know." Although Austin focus is for photographers many of the tips and features he highlights are applicable for architects as well and everyone should give Austin's post a read.