Sigh. I keep getting scooped. I've been meaning to write about what we learned in the actual real world about the asteroid 2007 TU24 -- the one that missed us at the end of January and had no effect on us despite the cries of doom from others -- but then Sean Welton of Visual Astronomy went and wrote up a good blog post about it!
So go read what he said. And check out JPL's stuff too.