http://news.cnet.com/8301-1023_3-20045633-93.html
To quote:
It may be game, set, and match for Lendle. No, not Ivan Lendl, the former tennis great. Lendle, the newly hatched e-book lending service.
Lendle first reported the news via Twitter: "Amazon has revoked Lendle's API access. This is why the site is down. It's sad and unfortunate that Amazon is shutting down lending sites...According to Amazon, Lendle does not 'serve the principal purpose of driving sales of products and services on the Amazon site.'"
Good game, Amazon. People won't be lending books, only buying them from you.
Where are consumer rights when we need them?