Microsoft has recently announced the first purchasable civilization pack for Age of Empires Online, a multiplayer version of the popular RTS series by Ensemble. What's more interesting is the team has also announced that a Windows Phone app will be made available later this month.
The Age of Empires Online app will allow players of the PC game to view statistics and recipes for items, access to a materials calculator that displays which items can be crafted with available resources on the account, and will enable users to view most popular items crafted in the community. Unfortunately no client as of yet, but here's hoping.
Update: The app is available to download for free.