I've been tinkering with this to implement the share charm into my app: http://code.msdn.microsoft.com/windowsapps/Sharing-Content-Source-App-d9bffd84
It's been a great resource, but I seem to be having trouble getting Image sharing to work when using SetBitmap().
When using the Delayed Renderer example or commenting out the StorageItem part of the image sample, the share panel comes up, but it says I don't have any apps available to share that data with. I've tried a couple of different photo apps from the strore. Is using StorageItems in the data contract the way most if not all apps accept image data, or am I missing something?