Brian's Tech Blog

Link: http://rhomobile.com/

Shameless plug here - I'm working for a cool startup in Cupertino that has brought ruby to the mobile device. You write apps in ruby and html, quite similar to rails apps, and then you can deploy your app on several mobile platforms. From their website:

Rhomobile's open source mobile application framework Rhodes lets you quickly build native mobile applications for all smartphone operating systems: iPhone, BlackBerry, Windows Mobile, 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.

Another cool thing that Rhomobile provides is an online IDE. You create your apps there, and then select what device you want a build for. No need to spend time setting up mobile SDKs, it's there for you already. Currently in open beta: http://www.rhohub.com