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Asteroids Flyby — 2010 RF12 & 2010 RX30
Ernesto Guido writes "Two small asteroids (2010 RF12 & 2010 RX30) will pass within the Moon's distance of Earth today, September 08, 2010." One is 6-14 meters and the other is 10-20, so even if they change course, don't expect Bruce Willis to be called in.
It all depends on the composition of the asteroid. If it is more dense (like iron), it may make a lot of damage or create a small tsunami, since it wont disintegrate or explode before impact. If it is less dense (ice/rock), it should partly disintegrate or explode high in the atmosphere.
Yes, there would be damage, like the Tunguska event in which estimates give it "a few tens of meters across", but the uninhabited area of the world is a lot larger than the inhabited area, so most chances are there would be few casualties, except if it explodes directly over a large city.