PC Magazine: “Stanza is the best e-book reader for the iPhone, and my favorite.”
21 Cool iPhone Apps - Stanza

My iPhone becomes unstable after installing Stanza, causing lockups or data loss

This is a known problem with the iPhone Operating System, and has nothing to do with Stanza itself. Any third-party application may trigger this bug. It is discussed at: http://discussions.apple.com/thread.jspa?messageID=7834367. We expect that a future update to the iPhone OS will prevent this problem from happening.


Apple patch in September fixed it

That instability you're experiencing from 3rd party apps seemed to straighten out for a lot of people after the patch Apple released in mid September.