A quick rehash of Tobias Ahlin's css trick for animating link underlines . This is a pretty smooth hover trick for links. Jenn Lukas would be pleased.
The only thing it's missing is the a little affordance to help a link look a bit more like a link and be accessible via the keyboard.
Adding transitions on hovers is pretty darn awesome. I think I may use this on the new BlendConf site launching in a couple of weeks.