TransparentDock 2 is an application that allows customization of the Mac OS X dock. The transparency level of the dock is fully adjustable, from fully transparent to fully opaque, or somewhere in between. An assortment of options are available to enhance the appearance & functionality of the dock, and each can be applied independently, or combined into a theme. A fully customizeable palette allows saving & switching between an unlimited number of custom dock themes. As always, built-in reset options allow returning the dock to its original state.

Limitations: Registration is not required for basic functionality. After one week of use, a reminder window will appear upon launch reminding how cool it is to register. The suggested shareware fee is $8.00, but may be modified somewhat according to what you feel the program is worth.

Requirements:
OS X 10.2 - 10.4
AppleScript 1.9 (installed with Mac OS X 10.2) or later
PPC