Asteroid 2004 MN4 - the one that was touted as the most likely to hit Earth when first noticed, has had its orbit calculated more accurately as a result of further observations, and it turns out it'll be visible to the naked eye as it goes past Earth at a lower altitude than the geostationary satellites.
It's projected to be about magnitude 3.3 (definitely naked eye), and will be moving pretty quickly across the night sky.