For Personal Documents there is a thread discussing resetting the Furthest Page Read.
Quote:
Originally Posted by quiris
Vmurph, use my own bookmarklet for clearing furthest page read... in Personal Documents: MYK:CFPR2.
1) Go to site: http://blaut.biz/bookmarklets/
2) Drag and drop on your bookmarks bar an orange link: MYK:CFPR2
3) Go to http://amazon.com/myk site
4) Click the dragged bookmark MYK:CFPR2
5) Below each book a button Clear furthest page read... will appear.
6) Click a button below your chosen book.
7) Wait a second for confirmation dialog box: The furthest page read has been reset.
8) That's all 
Note! If step 7 will fail repeat from step 6 one more time 
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(Actually, there are several versions on the site, this announced the first, but you need the later ones due to updates. They are all on that page, though.

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