Aqua Dock is a superior program for three main reasons:

1 - You can not only add .png and .ico and any of the same things ObjectDock can add, but you can also import old YZ Docklets to your bar also.

2 - Aqua Dock does not use GDI, but rather DirectX which is seamless with Microsoft, and therefore Aqua Dock is flawlessly smooth and crystal clear. Object dock will become grainy if you wich to zoom in more, and will hang for a second when moving the mouse fast along the bar. Object Desktop will also sometimes use 99% of your proccessor, while Aqua Dock uses 5% at it's most busy moment

3 - Aqua Dock is not only more user-friendly with the interface setup, but was made 2 years ago, and has been perfected with the new 1.0 release march 24, 2004. You can see screenshots and download it here > http://www.softpedia.com/public/cat/13/9/13-9-204.shtml

Enjoy!