Programmatically Drawing Gloss Gradients

You know how your application icon gets turned into a nice glassy looking icon on the fly when you install your application on the iPhone? Well, if you've ever wondered how that effect is achieved programmatically (as opposed to being done in Photoshop and exported), you should check out this awesome tutorial by Matt Gallaghar.

This version is designed for the Mac, but Jonathan Wight has ported it the iPhone