The Guardian features a fascinating article on where developers should focus their freetime development over the next year and half or so. It goes on about the options between building for iOS, Android and Windows 8. 

And then Windows 8. If you learn how to build apps for Windows 8 you’ll emerge with skills that are bang up-to-date and are readily transferable into your day job. But again, you might make some small amount of money shifting applications. But things get more interesting after next Christmas…