Since I've started learning about aquaponics, one of the coolest technologies that I've seen is the ZipGrow towers, made by Bright Agrotech. They're a way to grow vertically, with hydroponics or aquaponics. The idea looks very simple. It's one of those, "Why didn't I think of that," kind of ideas.
The ZipGrow tower looks like a square fence post with a 2-inch slit cut down one face long-ways. A long strip of polymer foam with very large pores is folded in half, and inserted into the post. The plants roots grow in between the folded foam, and water drips from the top of the post down the foam, watering all the plants roots. They have some amazing results with these things on their farms in Wisconsin. Good for these guys!