Did you watch the video? They suggested using fishing nets to gather the hay, bringing it to lined dumpsters at beaches and ports and then using it in incinerators with woodchips/etc to get energy from it.
Who knows if it would work out that well, but that's the idea.
The idea has potential, and it's certainly worth experimenting with while the opportunity is there. This will not be the last oil spill. If BP, DOE, and MMS were smart, they would slip these guys a few hundred thousand to a couple of million in funding to do some prototype testing in the field under realistic conditions.