One thing I really love with the Python programming language is its incredible extensibility. Here's a list of 50 awesome modules for Python, covering almost all needs: Databases, GUIs, Images, Sound, OS interaction, Web, and more.
Vista lighting effect is very popular, and many tutorials explaining how to recreate it can be found on the Internet. However, they had a point in common: Being relatively inaccessible for beginners with Photoshop. I therefore propose my own version of this tutorial, in order to create a striking effect, quickly and easily.