Apple did eventually reverse themselves on this, but here's the original blog post from Google about it (they originally supported iOS through Mobile Safari because of Apple's rejection).

http://googlemobile.blogspot.com/2009/07/google-latitude-now...

> We worked closely with Apple to bring Latitude to the iPhone in a way Apple thought would be best for iPhone users. After we developed a Latitude application for the iPhone, Apple requested we release Latitude as a web application in order to avoid confusion with Maps on the iPhone, which uses Google to serve maps tiles.

It took almost two years for Apple to cave.

Latitude is already available for iOS. http://itunes.apple.com/us/app/google-latitude/id306586497?m...

Latitude is available for iOS, so that means we should not fear they will reject maps... Right?