From the Minesto website comes news of an invention in 2001 that may have a significant impact on global power generation from any type of ocean current moving at velocities of between 1.2-2.5 m/s and at depths between 60-120 meters. These numbers are very impressive (for being so small, or in other words, for making energy production so accessible)! A couple of youtube videos appear to have more on this new development at

https://www.youtube.com/watch?v=wdOvS-3e0MQ and
https://www.youtube.com/watch?v=0AamnNxkPUw

To hear more updates on these and related developments, please find the GlobCurrent project on twitter.