Interest in the Calcium project has been huge this year. So much so that the number of downloads for Calcium has passed 10,000.
In the works for this year is a Windows Phone version of Calcium, which I have been implicitly working on during the writing of Windows Phone 7 Unleashed. I will also be improving support for the Silverlight for the desktop version of Calcium.
If you're a Calcium user, and have feature requests, be sure to add them to the tracker. I use that a lot to determine the priority of new features.