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I do exactly this (preloading pages) when traveling. While in the airport lounge before or between flights, I'll click "open in new tab" for 10 to 30 pages at times while I have the 802.11 access. When the boarding call comes, I'll put the tablet to sleep and get on the plane.

When we're cruising, I'll wake the tablet and read the pages that are sitting there.
There's an app for that now (and probably more on the way): Offline Pages



(It helps that my multi-touch tablet runs a full x64 OS with 5 GiB RAM, SSD, ....)
Yah... i'll bet there's nothing quite so nice as html (and jpegs) when viewed with a 64-bit OS. :)
 
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