Kind of weird how nature works, but they say, due to the natural seepage of oil into the Gulf of Mexico that has been ongoing for years and years, there is an abundance of oil eating microbes in the Gulf. With all the extra oil dumped into the Gulf from Deepwater Horizon the microbe population has shot up and these microbes also like to munch on the 'toxic' dispersant that was used to break up the oil. Of course, this does nothing for any oil that made it into estuaries and came ashore.
http://news.yahoo.com/s/ynews_excl/ynews_excl_sc3270