I'll take "PPI" literally to mean pixels per inch. My running 1280x960 on a 17" monitor from 1999 CE results in around 105 PPI. Too bad the U.S. is still using archaic units of measure, huh.

How many pixels do you have per inch? It has not increased for the typical user, I don't think. Most people don't run a higher resolution to increase their PPI and then making everything on screen larger; they do it to show more at once, at the expense of everything on screen being smaller. Well, that's me at least. I'm aware of it. Sometimes I'll decrease the resolution if it bothers me enough. But once you increase your screen area be it an upgrade in monitor size or adding another monitor, you don't need to increase your PPI. It certainly feels that innovation in the hardware market has slowed down for a while now, to where more people are upgrading their screen real estate. And it seems people are fine with 'subpixel' font anti-aliasing... I certainly like ClearType, with its contrast tweaked to look quite brilliantly invisible on my CRT.

Sure, I'd love to have a densely hi-res screen, a print-quality display. For running high-res versions of moshi's clocks :D