If you had one of the Hanlin V3 family and OpenInkPot, you could mark books as read. The OI guys are working on a version for the Sony PRS-505 (I think). Perhaps you'd like to check with them & maybe donate.
I really like that I can mark books as read and keep my folders (i.e. collections - yes you can have folders with OI) for each author together and still see which I have already read.
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