Originally Posted by Sweetpea
It's not only the resolution.
We have two 7" devices. Both have the same resolution: 1024x600. The PPI of both devices are equal at 179. Yet, my device is a lot crisper and easier to read with a smaller sized font.
Anti-aliasing and the font engine matter. And some vendors tweak their software for better text rendering so some apps are better than others.
But when comparing products using the same OS, the hardware capabilities are going to be the main determinant and dpi is a pretty good proxy for text clarity.
It's not hype... more like shorthand.