Two quick things about 2010 AL30, the small object that passed the Earth earlier today:
1) I wrote that it looks to be natural and not some booster, but now an ESA scientist says it might be a booster from Venus Express. His argument is a good one, but it's difficult to prove.
2) Universe Today has a very cool animation of the object as it slid past us, created using 30 still images. It's fun to watch, if a little dizzying.