I use my 770 almost exclusively for reading e-books. Turning off WiFi extends battery life, but it is still less than I would like (I don't usually let it run down, but I guess about 6 hours max). I don't think it is possible to read encrypted PDF files, there is an included PDF reader and evince also displays PDFs (not yet for 2006). I use FBReader, which is great for unencrypted formats (including .rtf, and unencrypted .lit files). I used to have an eb-1150, which was ok but I prefer the 770 even with the smaller screen. If the screen was a bit bigger and the battery life about 2x it would be perfect. Extra batteries are available, but I don't know of any separate chargers (so they would have to be recharged in the 770).
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