[kahm]

Some back of the envelope twiddling, and comparing the devices I have on hand to measure.

librie (Standard 6" eink screen)
122 mm 800 4.8031"
91mm 600 3.5827"

~167ppi, 4:3 aspect ratio, 6" screen

Zaurus (c series)
75mm 640 2.9528"
56mm 480 2.2047"

~217ppi, 4:3 aspect Ratio, 3.7" screen

Zaurus (6000)
81mm 640 3.1900"
60mm 480 2.3622"

~200ppi, 4:3 aspect Ratio, 4" screen

Libretto U100
157mm 1280 6.1811"
94mm 720 3.7010"
207ppi(h), 194ppi (v) ~16:9.5 aspect ratio, 7.25" screen

(Diagonal/sqrt(AspectWidth^2+AspectHeigh^2))*AspectWidth=Wid th

So:
Panasonic WOrds Gear
1024x600, ~16x9.4 (assuming square pixels), 5.6"
123mm 1024 4.8284"
72mm 600 2.8370"
~212ppi

So it's just about average. PDF's look great on my Libretto, so they'd be just as good on the Panasonic.

If the panasonic were thin and light enough, I'd consider getting one.

Just for kicks I calculated the PPI on the open moko linux phone, which has a 2.8" 640x480 screen - It's got a gob-stopping 285ppi!!!