The Bonefish & Tarpon Trust is keeping an eye on things and they have a page devoted to BP Spill news.
Back when I was in high school a train derailed just north of my little mountain town. The two cars ended up in the river, one of those was full of a biocide. The poison killed everything in the river for about 45 miles or so… devastation.
This reminds me of that, just on a much larger scale and impacting more than just the residents of a tiny town with a pretty river.