In DVLUP, you earn experience points (XPs) for completing app development Challenges, Quizzes and other activities related to building and distributing apps for Windows Phone and Windows 8. You can trade in your XPs to receive rewards such as the latest Nokia phones, accessories, gift cards, and app promotion campaigns – more than $5 million (USD) worth of value. Register now at http://www.dvlup.com/.

Yes, it’s both for Windows Phone and Windows 8!