Firmware release 3.2005-51-13 shut down browser caching. Prior to updating, I I had been quickly browsing sites such as slashdot or BBC News before heading to the bus stop, then using the back arrow during the comute. Since the update, mucking with opera.ini made it sort of work again, though wasn't able to get the slashdot page to cache properly.
I think the ideal would be to have caching normally off, but a browsor icon
to store the current page to rsmmc flash. Should be a configuration menu to indicate how deep into the page to cache. Also a momentary popup indication of how many of the most recently selected pages fit into the space allocated for cache.