X Neat Software is an effective utility in the must have list. XNeat gives you full control over your Windows by extending it's features like:

1) TaskBar Utility ( Manager - Sorter - Arranger ) : allows you to order ( sort ) taskbar's entries the way you want !!

2) Stay On Top: When any window is selected to be Always On Top it will never be overlapped by others windows.
Some Applications provide keep window on top feature in its menu like MSN Messenger, but most applications don't.
Window always On Top is very handy if you want to keep yourself isolated from all annoying windows that may popup while you are working or to keep some information always in front of your eye & sure it provides fast access ..

3) Show/Hide Windows: When any window is selected to be hidden it will disappear.
Some Applications provide this feature like MSN Messenger.. but most applications don't like Microsoft outlook express.
Show/Hide Windows feature is very handy if you want to keep an application running in the background, or to hide a window that will not be used for a while.
Show/Hide Windows helps you to clean your desktop and add more space to your taskbar.