SpaceX announced just last week that they have successfully conducted their first rocket burn using three engines. This is a critical step in the development and construction of their Falcon 9 rocket, which will use nine of their Merlin 1C engines.
While they were burning, the engines generated over 270,000 pounds of force, and consumed 1,050 lbs of fuel per second. The next step for them is to test the system with five engines, and then the full nine. The Merlin 1C engines have power similar to the Saturn V engines. Except there will be nine of them.
These tests will likely start coming fast and furious, as the first Falcon 9 is set to be delivered by the end of the year, so I'll keep you updated.