Taskix is a free utility that allows you to reorder the buttons in your Windows XP taskbar in-place using your mouse. If you have "Group similar taskbar buttons" set, it also works inside stacked groups! Simply extract the files from the ZIP into a folder of your choice and start the EXE. It is most straightforward to use and uses very few system resources. You also have the option to configure it to be restarted with Windows.
CSFastRunII is a desktop enhancement that allows users to run applications, groups of applications or specific data files like documents, spreedsheets, development projects, etc from an easy to understand dropdown list control housed integrated into the Windows taskbar so no real estate is lost. Explorer add-in allows you to add applications and shortcuts easily with a right click on the file.