In December I downloaded Dean Koontz's "Darkfall" as pdf from BoB. The first thing I noticed was that the filesize was huge (18mb). Because I just bought my eReader I didn't think too much of it until I found out that on some page I could use my Sony's dictionary function and on other pages I couldn't. It is also the only ebook I have read that has managed to crash my reader (not responding until I pushed the reset button several times).
After some investigation I found out that the pages with even number converted as text whilst the pages with uneven numbers are converted as an image.
I don't know if the book is available in other formats since it isn't available at the time due to the model agency thing.