Like the article mentioned, coating a boat seems like it could be awesome. No drag, zip through the water. If it does work like that, I'd imagine we'll also start seeing it in competitive swim suits.
Forgive me for not being able to find the link to reference, but this very same question came up on Reddit aswell.
The company replied to the suggestion saying yes, the technology has marine uses, and coating a boat with the compound does reduce the drag - the issue being the stability of the boat is reduced in turn which means the running speed needs to be increased to compensate.
Kind of like when the space shuttle re-enters the atmosphere, isn't a significant portion of the slow-down caused by the pressure of the water being displaced ahead of the boat? So even with no friction, you'd still be pushed around by this giant mass of water. I'd be curious to see what the contributions of the drag on the bottom and sides of the hull versus the water ahead of the bow are. Links, anyone?
http://www.beilstein-journals.org/bjnano/content/pdf/2190-42... A good introduction, and from a journal without paywalls, and having quality papers on the subject.