A side note, the res of the iPad is 768 X 1024, so when you rotate it you'd think it's now 1024 wide. It's not. It's still 768, automatically resized by the iPad. (Several resources out there where I've learned this.)
Yes, that's why I said "physically bigger". It's the iPad's version of zooming in when you want the whole page to be bigger, not just the bit you're currently reading.
The other day I looked at a weeny little graphic and realized it would not have fit on the earliest mac screen. Physically yes, but pixels (as a unit of html measurement) are no longer 1/72 inch. Not even on my monitor, which is set to be eyesight-friendly.
Matter of fact, the iPad's screen is just a smidgen bigger-- physically-- than those 512x384 Macs. I had to measure to convince myself. Weird.
Looking again at those numbers, something else jumps up and hits me in the face. D'oh.