ON A BOAT!
http://www.fastcoexist.com/3028391/james-dyson-is-designing-a-giant-vacuum-on-a-boat-to-clean-ocean-trash
Okay maybe right now it is focused on rivers, but with all the floaties we saw thanks to CNN etc. coverage of the missing Malaysia flight I would expect eventually the ocean will get the ol' bagless treatment too.
Y'arr! There be floating plastic booty to be had!
GET THE GIANT CART THE RECYCLING CENTRE WON'T KNOW WHAT HIT 'ER
Ya, a little disappointing seeing it a river solution.. The open water issue would be much harder to solve, and the scale makes it hard to be economical unless some new techno magic is discovered.