One, tonight the entire Samoan nation is going to travel in time:
Two, here's an awesome video of Comet Lovejoy.
And lastly, here's a site where you can view realtime earthlight, i.e. know where dawn and dusk are happening worldwide (and there's a page for the moon phase as well):
Related to this, I recently downloaded Desktop Earth, which shows a similar lightshow, complete with reasonably recent cloud formations from weather satellites, perpetually updating itself on my home screen. I love it!
(Note: It says it's for Windows XP, but I'm running it no probs on 7)