So lets say you're on the move and get a tweet from a friend that they've just added something to Thingyverse. Or someone tells you that this one spur gear right for your project can be downloaded from the Shapeways 3D parts database, only you're walking around. What do you do? Well from now on you can download the Netfabb STL viewer on your Iphone. It is free. You can point it at a URL and it will download the STL and let you see it while you are out and about. Using the Iphone's touch pad you can spin and rotate your models while looking at them from all sides. You can pinch to zoom in and I think its generally more intuitive to use than a PC STL viewer. Check out the video of this fun free tool below or download it on the App Store.