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Right click on the RocketDock and you get a menu that lets you adjust settings. There are various themes that will style the look and feel of the RocketDock, and from the aforementioned Extra's link a long list of downloadable styles and docklet programs that work with RocketDock, or that other people have contributed. The RocketDock folks include their favorites in the install, but I found a few were broken. The extras section could use a little work, since it's currently missing user ratings, and feels a bit like searching for a needle in a haystack, but again, one can't complain too much when benefitting from such a useful and in my experience rock solid program.

Once RocketDock is installed and running, you'll probably want customize it by removing items you don't want, and adding programs you use frequently. Adding and deleteing is incredibly simple. To delete, hover over the icon of the item you don't want on the Dock and right click. You'll get a choice to delete it. To Add an item there's also a menu item, but RocketDock offers an easier method that will work fine for most people -- find an icon on the desktop or in the menu for a program you want added to the RocketDock and simply drag the icon to the RocketDock!

Even the most basic windows user should have no problem adding and deleting items, and in no time will be enjoying one of the usability features that made OS/X so popular. Click on the thumbnail to the right, for a screencap of my Vista desktop with RocketDock at the bottom of the screen. This was accomplished by unlocking the Vista bar and dragging it to the top of the screen, then relocking, and configuring RocketDock to appear at the bottom of the screen. The only major negative with RocketDock is that as of the current version, while it's free and published under the Creative Commons license, it is not open source, so if you have problems with it, there's not much you can do other than to contact Punk Labs. They do have a bug tracker on their site, where you can report issues. Unfortunately, RocketDock doesn't have a 64 bit version, so you can't run it on 64bit XP or Vista. *Note: according to a comment left by Michael F., RocketDock works fine on 64bit Vista, and presumably will also work on 64bit XP. I don't have a system to test it on however
Update - 2011: Since writing this article I installed RocketDock on a 64 Bit Windows Vista machine, and a Windows 7 Machine running inside a Virtual Machine. It worked fine in both places, however, the Windows 7 vm doesn't necessarily constitute a good test of a machine with a typical graphics device driver that would support Aero. From what I've seen however, it does seem to work ok, even though Punk Labs has never stated they support it.

In summary RocketDock is fast, stable, and free, so give it a try and say goodbye to Mac Dock envy.