FWIW, I use Aldiko for Android for my ebook reading, and I use their collections and tag functions to distinguish read and unread books. I find it works quite well. I can also read the meta-data and tag as I wish. :)
I like my big touchscreen but do wish that Sony had thought a little bit more about functionality for people who have really big libraries. My internal memory is 2 GB and I have 2 SD card slots. That's a lot of books to try to keep track of and I'm not even close to maxing out my internal memory.
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