Originally Posted by catsittingstill
I'm sure I've read that Stanza works with the iPhone, though I don't know if the iPhone version reads unprotected Mobipocket, as the Kindle does.
It does not -- it uses ePub as its native format. You can convert Mobi documents to ePub using Calibre and import to Stanza (don't use Stanza Desktop to do the conversion, it does a very poor job).
Alternatively, the Bookshelf app for the iPhone reads unprotected Mobi files natively.