Emergency Airdrop or Balde a Balde - one of those two will win in my opinion - outstanding products made out of seemingly simple ideas.

Inventions are 10-a-penny but innovations (especially to problems in the developing world), now there is a challenge worthy of a contest. None of these appear to go beyond the invention and address the key challenge of how to scale, market, distribute, maintain etc., the traditional show-stoppers that prevent great ideas becoming everyday reality.

The BETH project - Assuming it works well. The winner!
Stephoe - I don't think it adds enough value to the hoe to pay for itself.
Smart Aid - Sounds nice but I think the system would fail a cost benefit analysis.
Safety Net - I think the problem has been solved buy a "predator mouth" just behind a non-target escape vents.
ReWired - Cool but what do you do when you want light to read in your comfy chair and your roommate/children want light at the table.
Revival Vest - Sounds expensive for what it provides But if you have the money...
Reach & Match - I'm not sure the need is as great as the designer thinks but I hope it is cheap enough to become common.
O2 Pursuit - I like. Much better than an electric bike.
LOUIS - Why?
Hop! - I have pulled a 2 wheeled suitcase a couple miles (3km) sidewalks and across streets with a cord stung over one shoulder and only had it fall over when going over a curb without the wheelchair ramp. The Hop! is too complicated and costs too much for what it does.
GiraDora - I'm not wild about the design but it is a good idea.
Fil’o - I know a son of a deaf woman. I think it solves a problem that exists mostly in the mind of its inventor.
Emergency Airdrop - What makes this better than say bed sheet parachutes?
Balde a Balde - A good idea but as a siphon it is designed wrong.
Alto - The flexible drive shaft is going to wear out real fast and the power control is just begging to start the machine when you are still trying to aline the fabric.

i'd go with the emergency air drop. cheap to make, easy to use, helps the world, and doesn't require any other item to use...such as water in the cases of the balde a balde or clothes washer. water is in short supply in many areas of the world. if the clothes washer also recycled the water; then it would have my vote. for Brendan; the contest is about a problem solver; not a business plan that scales, markets, distributes, maintains, etc.

I do like the two mentioned by Tommo and also the washing machine seems a boon to developing countries. Brendan is right about marketing problems, but Gizmag has taken the first step in garnering attention and Kickstarter is in the wings for production. Deep pockets, however, are still necessary for full realization. There are organizations such as Oxfam and Mercy Corps that just might get interested.

I'd say that the SafetyNet, GiraDora, and Blade a Blade would have the most significant impact.
But, let me just say that the Alto is beautiful and makes me want to start ripping up my clothes just so I can use that thing to put them back together.

Emergency Airdrop for me.
And after the package has landed the recipients may be able to burn the cardboard Airdrop for fuel.

wow, most of those are really good idea's, I like competitions like this...fun to watch.

I believe the emergency airdrop has already been done and possibly even used in rescues here in Australia. It was/is called the Heli-box and there is footage from 2007 of it being used or tested from an Australian air force Caribou transport on the web. Do a web search for more info. Cheers

@RjAust. Absolutely, I can remember the Heli-box being trialled back in the 1980s when I was in the Air Force at our transport base in Richmond NSW. This is not a new idea.