So this is a 3D snow simulator, implemented entirely in 2D. What that means is that each flake of snow has it's own 3D position and it's movement is all dealt with in 3D, but it isn't drawn in 3D, it's drawn in 2D with appropriate transformations applied.
I just wrote this to figure out that code for something else I'm working on, but I though it was cool enough to show off.
50000 snow flakes are simulated, with a random wind (set at load time).

To control camera movement, you use the arrow keys, W, and S.
Left and right control X movement, up and down control Z movement, W and S control Y movement.

There's no rotation because that would add a huge amount of complexity when I don't even need it for the real project. So I didn't implement it here.
Still, it is pretty nifty. For a couple minutes, anyways.