Space X is looking good to launch its Falcon 9 + Dragon capsule on Saturday morning at 08:55 UTC (04:55 Eastern US time). NASA tweeted about it, saying there's a 70% chance of good weather at that time. It's Florida, so that can change in an instant. Check with NASA and Space X for updates.
Space X put together a press kit with details on the launch and mission activities. Via Universe Today I saw this nice video with a great CGI animation of what will happen:
It's actually a couple of years old, but still fun to watch. NASA TV will be carrying the launch live, as will Space X, and Elon Musk -- CEO of Space X-- will be live-tweeting it.