"The oil slick in the Gulf of Mexico appears to be dissolving far more rapidly than anyone expected..."

Oh, no!

The immense patches of surface oil that covered thousands of square miles of the gulf after the April 20 oil rig explosion are largely gone... [The] few remaining patches are quickly breaking down in the warm surface waters of the gulf....

The gulf has an immense natural capacity to break down oil, which leaks into it at a steady rate from thousands of natural seeps. Though none of the seeps is anywhere near the size of the Deepwater Horizon leak, they do mean that the gulf is swarming with bacteria that can eat oil.

Storms also helped, along with evaporation.