http://www.engadget.com/2010/10/25/wi-fi-direct-certification-begins-today-device-to-device-transm/This is something that really tickles my fancy. Basically Wifi Direct allows any device with the software to set-up a small network between wifi enabled devices to allow for file tansfers. Basically what bluetooth can do, but on a larger scale.
What I really like about this, is that if you buy a device with Wifi Direct today, it will work with a wifi device you bought last year. The 802.11b standard isn't supported, but most devices made within the last few years use 802.11g/n.
Only one device needs to have Wifi Direct for two or more devices to link up to the network and transfer files and other things.
The article says that Wifi Direct 'is simply a pipe that software can dictate as it sees fit' and they expect the various app markets and developers to aid in the rollout of this technology and do interesting things.
One interesting thing to do with this sort of technology would be the transfer of information between similar devices even if their users aren't using the device or aware of the transfer. Yes I do mean Nintendo's Streetpass.
The article doesn't make note of Nintendo utilizing this technology (or something similar) but that was the first thing I thought of. Also, if the 3DS doesn't use Wifi Direct, it could potentially be upgraded to use it with a firmware update. It would Streetpass, but with any wifi device, allowing easy transfer of cell phone pictures to the 3DS for editing, and 3DS pictures to cell phones for web hosting when there is no Wifi router around. I was thinking there would be some piracy issues that would prevent Nintendo from signing on to widespread use, but with regular firmware updates they can combat piracy as actively as pirates develop work-arounds.
This technology could open up a whole new level of harmony between devices if cell phone carriers and other manufacturers don't limit it like they did/do with bluetooth, and other P2P applications.