Taskbar Shuffle 

Taskbar Shuffle is a nice application that allows you to order your taskbar. The application allows you to use the drag and drop functionality in your taskbar, which makes sense. With it, you can simply select the buttons that are next to the Start button in Windows and move them around any way you like. You can also make groups of buttons that will go up as a pop-up list, to save you some space. The idea is great and it is really helpful, since, in my case, I always have tons of windows opened and they always take my taskbar space, and it becomes increasingly difficult to find what I am looking for. Taskbar Shuffle also allows you to move and reorganize your tray icons. You can do the same things that you can do with the taskbar items. Other than that, the application also is great because it adds button programming on to your mouse. It becomes really easy to close a Window by simply middle-clicking on one of the taskbar buttons, a la Mac. It really doesn't get any better than that. And it is all free.