Products that interaction design and information architecture methods address

I like Dan Saffer's diagram looking at interaction design and information architecture (PDF) through the lens of what kind of products each practice addresses. It's concrete, instead of the hand-waving turf war some people enjoy. It reminds me of Marti Hearst's quadrant from CHI2001 panel on measuring IA (requires IE, see slide #2 'A Simple Taxonomy'). The axes for the quadrant were complexity of content and complexity of applications...