Found 2 comments on HN
Read this: http://www.amazon.com/Fast-Food-Nation-Dark-All-American/dp/... and tell me if you want to eat at McDonald's again.
ryanfitz · 2011-11-03 · Original thread
some of the kindle product pages have a specific section mentioning the borrow feature. For example http://www.amazon.com/Fast-Food-Nation-ebook/dp/B003G83UI2/r...

However I don't see this on most of the kindle pages, so I assumed it was only available for specific books.

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