Interesting topic!
Been racking my head trying to think of some that haven't been mentioned yet... I've read about so many interesting things that have been created - some even here in SA, but unfortunately, I live in a tiny little matchbox in urban suburbia, and therefore haven't tried many of them myself yet... maybe one day when I grow up!!!
Here's my top 5 list - interestingly (and unfortunately, sadly!) the average South African thinks of 'Eco-Friendly' as buying organic veg from Woollies, and have no idea of what's happening right under their noses

!!! Here goes!
Eco Bricks - 'collapsible' cloth (...of some sort

) bricks. The idea is that instead of having to cart away all the soil that gets dug up for the foundation (using loads of fossil fuels!), you fill the bags with them - instant brick!!! They're soundproof, waterproof and fire-resistant. After plastering, you can't tell the difference - and you save substantially on manpower! I think they're a 'Proudly SA' product manufactured by a company called Eco Beams.
Aquaponics - a pure and simple marriage of aquaponics and hydroponics. There's a guy in Durban who has mastered and simplified this great way of feeding loads of people with tilapia and fresh organic veg using minimal land space - in so doing, he recycles practically the same water continuously through the veg strata and fish tanks - all the nutrients needed for the veg come from the fish tanks!
Mohamed's Egyptian rooftop patio/gardens! You gotta love that concept

!!!
That guy who recently figured out how to harness more solar power from a tiny little panel by using mirrors - although, I can't help but wonder if all these mirrors reflecting at different angles aren't somehow going to wreak an eco disaster on their own... imagine, 'blinded' pilots and birds! I'm hoping we don't hear in a few years time that we're scorching more holes in the ozone with all these mirrors - so my vote on this one isn't quite 100% yet

!
Water recycling units - there's a company here called Water Rhapsody who's created incredible (considering the pleb I am, I think they're incredible!) water recycling units. I'm sure they're not like a major new thing - but I'm seriously impressed with their unit that recycles all the used water in the household and uses it to flush the toilet - I really think that's cool!
...and last, but definitely not least (yes, I know this is #6, but it has to be mentioned!) this new trend in some countries to utilise methane gas for cooking - that's it's utilisation in it's simplest form, but considering how hectic methane is for our atmosphere, I think it's seriously awesome! We used to have a similar system at our previous home where we used methane to braai (barbecue) with during summer - it worked like a bomb!!!
If I had my way (please, somebody, vote for me at the next election - I need political power

!!!) I would enforce a ruling that all homes being bought/sold in the 21st century would have to be installed with solar panels, water-recycling units and methane friendly methods of energy utilisation!!! ...and that's just for starters!
AH! The perfect world

!
So yeah, I know my 'top 5 (...6)' sound incredibly complicated in comparison to what's been mentioned - but the beauty is that's it's 'modern technology' in its most user-friendly eco-format... and it's all do-able right now! It makes me delerious

with the possibilities if we could force the rest of the world to think like us

!!!
COOL!
