I'm very interested in the use of Math and Physics books on this device, mostly because that's what I'd buy a larger touch-enabled ereader for.
It obviously has been asked before, but I have some .PDFs that I'd consider good reference material:
http://arxiv.org/abs/0809.4587 (some random LaTeX abuse)
http://www.maths.mq.edu.au/~bon/Fourier%20Theory.pdf (another one) or
http://ocw.mit.edu/ans7870/resources...strangtext.htm (The first would be best for testing heavy math-LaTeX battering, and would probably be most evident in showing delays. Choose the pages with the most math. squiggly stuff in it.)
For people interested in general rendering time, and even more for the people interested particularity in the rendering delay of college texts (LaTeX mostly), this may be a useful example and test. I am also searching for photocopy texts, to compare, and I found tons of those, but they were all illegal! So if anyone could find this, I'd be much obliged, and, of course, even more obliged to Adam or Tribble or whoever would be willing to take the time to report on this.
The essence of this test would be to know the total render time and the added time compared with PDFs that are simple paperback texts (from ebook shops, or gutenberg, etc.).
Of course, this message would practically be a good non-math reference too. Such a wall of text for something simple.