Hi Steve --
We're sorry for the delay -- we still have had only 4 about 8 requests in those 2 years for a Windows phone app. The good news is that we started working on it about 3 weeks ago. It will use the same code as the iOS and Android apps to keep functionality the same on all three platforms. We hope to have a release in a few more weeks.
I've made a note to come back and update this post when the release is out.
Doug