I don't even think going as far as LRF is really necessary, I read giant RTFs on my 505 almost exclusively. I've had no trouble opening or turning pages in any RTF books over 1000 pages, including some that hit 2000.
The only downside to RTF is that it takes longer for the device to do the initial formatting when you first open the book. After that, though, unless you make changes to the document it opens right up without a delay, even the truly huge books.
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