I was recently asked to create the Matrix "raining code" effect, but the only help I could find was a 40 minute tutorial which was not very helpful, because it was layer based and very time consuming. After thinking about it, I thought, "Why not do it in After Effects with Particular?". I gave it a few tries, and voila, it worked. After that I created this tutorial. I hope you enjoy it, and will learn something.

Tutorial