Longtime lurker, but this piece of news incensed me so I finally decided to sign-up:
Amazon updates, sunsets Stanza
(After this release) "We will no longer be updating or supporting Stanza… We would like to thank you for your interest in Stanza, and let you know that Amazon is committed to providing the best reading experience on iOS though the Kindle for iPhone, iPod and iPad apps.”
There's always the possibility that Amazon may decide to donate Stanza to the open-source community instead of letting it die. Given their focus though on ensuring that the Kindle dominates, I wouldn't hold my breath.