Here's an object which I've found very useful especially when dealing with DMX pixel-mapping data. It's a drop-in replacement for jit.fill, with the difference that you can provide a list of target planes rather than just a single plane. This means you can easily take a list of RGB pixel values and fill a matrix with it using a single object.
Download below. Compatibile with Max 6 + 7, OS X and Windows, 32-bit and 64-bit.