The Apple App store is by far the largest and most successful of the application stores offered for mobile phones. After the success of the Apple App store Nokia, Google, and Palm launched their own app stores. A new development platform called Appcelerator Titanium has been announced that will allow devs to design for the iPhone and Android on one platform.
The Appcelerator Titanium platform is set to release soon and supports development of mobile, desktop and web applications. Using the software building an app on one platform will allow it to run on all other platforms supported.
That means that a developer could build an app for the iPhone and end up with a version for Android at the same time. That should lead to a boom in Android apps is developers adopt Appcelerator Titanium. The application was released in beta form on Monday and is open source.