Natique's NSS system. Looks a lot like the 'bu concept and, interestingly, being marketed the same way as "the next greatest thing for wakesurfing.". Both look like bolt-on POS to me.
http://www.nautique.com/blog/index/nautique-surf-system
http://youtu.be/6usVCaSxU2A
http://youtu.be/nTaV0sy5Nnc
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