SpaceX is about to launch their Falcon 9 rocket for the first time, carrying a Dragon spacecraft prototype. In theory, the new ship will haul cargo and crews of seven astronauts to the ISS.
Update: Launch has been aborted at the last second. No news on what happened, but they still have time to re-start the countdown before the launch window ends at 3pm EDT.
Update 2: Launch process has restarted. Stay tuned.
Update 3: It launched. Video added to the post.