When we want to develop applications that should run on different O/S's like Android, iPhone, BlackBerry, Symbian and etc., we need to know what options we have.
Rhodes is an open source framework to rapidly build NATIVE apps for all major smartphone operating systems (iPhone, Windows Mobile, RIM, Symbian and Android). These are true native device applications (NOT mobile web apps) which work with synchronized local data and take advantage of device capabilities such as GPS, PIM contacts and camera.
Whoop - everything mobile they say in just 4 steps!
These are just a few options. More to come...hopefully! :-)