The Times-Picayune has dedicated a section of its site set aside for this oil spill story and all related news stories. I've included a link to an animated loop that is updated daily as the story unfolds. Also, I've included a chart that explains what's going on - in general. There are more charts on the site.

The Times-Picayune Latest News: 2010 Gulf of Mexico Oil Spill

Animation: Gulf of Mexico oil spill growth and movement

Diagram from 4/30/10: Beneath the Oil Slick