Aaru is an XNA tech demo for PC / 360.  It demonstrates real-time depth map shadows, motion blur, depth of field, bloom lighting, particles, perlin noise (on the fire particles and clouds, shown) and simple 2D physics (applied to a 3D sphere).  There is also some basic lighting with normal maps.

Click the images for the full 720p versions. 

The philosophy was to create a 3D "tile-based" engine mimicking the feel of 8-bit and 16-bit era games with some extra 3D polish.

In the following image you can see the motion blur applied to the entire screen as the ball moves.  When the screen reaches the world boundary it stops and the motion blur is on the ball only.