Device Index developers

Mobile Burn: Developers will now be able release apps that use the in-app billing feature.

Mobile Burn: Android Developers finds Android 2.2 Froyo by far most popular version of platform, Honeycomb least.

The Inquirer: Tweet indicates Motorola will open up its tablet PC, which ships with Android 3.0 Honeycomb OS, to other platforms.

Revamped mobile app store now includes support for in-app payments, an improvement that will be particularly appreciated by gaming app developers.

Mobile Burn: Android 2.2 Froyo is now installed on 51.8 percent of all Android smartphones.

IDC and Appcelerator survey finds that app developers believe Google's mobile operating system has better long-term prospects than Apple's iOS.

The iPhone and iPad maker relaxes restrictions to its iOS Developer License and now says it will let developers create mobile applications using any tool they want as long as the new app doesn't download any code.

Nokia CEO Olli-Pekka Kallasvuo is offering a $1 million investment prize to anyone who can develop a smartphone application that improves the lives of people making less than $5 a day.

Various mobile OS formats provide lots of choices for consumers and steer clear of monopolistic platform battles -- like for the desktop in the 1990s -- but they give software developers a headache.