In just about 5 hours 57 minutes you can watch Curiosity’s landing.
Keep in mind that it takes approximately 14 minutes for a signal to get from Mars to Earth. It takes 7 or so minutes to get through the atmosphere and land. That means by the time anyone on Earth will know what happened Curiosity will have been on the surface for at least 7 minutes.
Time of the landing will be:
Aug 5, 2012 10:31 p.m. Pacific
Aug 6, 2012 1:31 a.m. Eastern
Aug 6, 2012 5:31 a.m. Universal
More information and to watch: http://mars.jpl.nasa.gov/msl/participate/
William Shatner video: The Grand Entrance
Whil Wheaton video: The Grand Entrance