From the blog:
Send us a screenshot of your Windows Phone app running in the emulator and we’ll send you a Samsung Focus Flash Windows Phone. Only apps that have not already been published, please! If your app appears in MarketPlace before December 23rd 2011 you can keep the phone - yup- you heard it - you get to keep the phone.
What’s the catch? None really, but there are a couple of little hurdles to jump through. You must have registered on AppHub using your DreamSpark login credentials. You then need to complete this form and email it back to us at email@example.com. First 20 complete entries get the phones!
This is one more promotional activity to get developers on board with Windows Phone, but this is important work The more developers that come to a platform, especially this early in the life cycle, means more applications, more mind share, more buzz around the platform, all of which can help contribute to the success.
And if you end up being one of these students, let us know what you release!