As just announced on the Windows Phone Developer Blog, we have released the Windows Phone SDK 7.1.1 Update. Immediate download is available on the Microsoft Download Centre and DreamSpark soon.
So rather than me duplicate all that good stuff here – check out blog and install the update.
One last thing, when you have done this PUBLISH your app in Marketplace AFTER registering for our incentives programme and you can win a Nokia Lumia 800 AND/OR a trip to the MTC where you get to meet our deep technical experts to home your app and your skills.