Achron is probably one you haven't heard of. It's essentially an RTS, but with time travel and time manipulation. You can slow down, stop and fast forward time, but you can also go back in time and change orders, cancel builds, set things to build, undo attacks, launch attacks, send units back in time to help themselves and even create grandfather paradoxes.
Essentially the game records everything that takes place over a 7 minute-ish window, and you can go back at any time and change events. Timewaves move from the past to the future to propogate changes in the timeline into the future, so changes gradually transform the timeline.
It's really awesome and mind bending, and each of the 3 races plays differently and have their own strengths. Oh and all of that time manipulation stuff works even in multiplayer too.
http://www.achrongame.com/site/news.php