In just about four hours, the Messenger spacecraft will be launched on its mission to explore the planet Mercury. You can find more information here:

http://messenger.jhuapl.edu/

And if you're awake at 2:16 AM EDT and want to watch the launch, the webcam is here:

http://messenger.jhuapl.edu/webcam/live.html

(As I post this, we're getting views of the Boeing Delta II rocket, waiting on the pad.)

Mark your calendars -- it will reach the planet Mercury in March 2011. (The odd thing is that with my Palm device, I can actually do this now...)