Earlier quoted context omitted.
That's not poorly handled memory management, it's good handling. Poorly handled would be to give you an out of memory error, or make the other pages disappear completely as if you'd never opened them at all.
I would have to disagree. My Droid also has 256 mb of memory, and I can have more pages open at once without it having to flush pages. This is still true with Pandora running in the background. Overall I'm a fan of the iPad, it just falls short in this area.
For all I know the iPad may do that so it can shut down memory chips and save the power of refreshing them. Just because it doesn't do exactly what you wand doesn't mean it's handled badly - it still does what it does gracefully and without errors or slowdowns.
It does after all not claim to be able to hold pages open indefinitely; and you could have saved them to some ereader app for future Reading.
Misuse ipad -> doesn't do what you want, is hardly a 'dirty secret'