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Facebook and Lala have done this. We added this to the Posterous Manage page, and it reduces page load times and makes that part of the site feel faster, especially when a user is exploring what's there and trying to find a particular setting or tool.

The key is to use the URL hash to drive page changes in JS, so back button, browser history, and bookmarks all still work.

I use Facebook everyday and they're quite slow and buggy. Sometime pressing back button doesn't work. Sometime even pressing the "previous" or "next" image icon takes a while or failed to load.

Especially in their image section: press "next" and use the back button immediately (but not too fast), you'll see some "oops"

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