OpenRA, an open source Red Alert fan project, has just released an updated Playtest version. This version contains updates for the user interface and a lot of multiplayer server features. There are also some bug fixes and changes that have made it into the project.
Overall, the last year of OpenRA development has seen a lot of progress and it looks like a very viable open source RTS project. Perhaps it will soon reach the fame of Wesnoth or 0 A.D.