Blush - Illustrations for everyone
RocketDock - RocketDock is a Mac OS X dock clone.
Interfacer - Collection of more than 200+ free design resources
Winstep Nexus - The Winstep Nexus Dock is a FREE* professional dock for Windows. With Nexus, your most frequently used applications are only a mouse click away - and Nexus turns working with your computer into a fun and exciting experience.
Neede - An online design resource library
ObjectDock - ObjectDock is the most popular animated dock for Windows.