Home of the Adobe Exchange
What is the Adobe Exchange? Simply a place that many, many skilled artists placed files for others to download and use. Photoshop and Illustrator brushes, patterns, gradients, actions, layerstyles, etc., there are so many that folks should start their search here before venturing out on the Web.

There are libraries of files for After Effects, Dreamweaver, Fireworks, Flash, and more, to be found as well.