Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.
GhostWin - GhostWin - Free Download -- Transparent Windows Utility supports Windows 2000, 2003, XP, Vista and 7
WindowTop - Easly set any window on top, just move the mouse to the top area of the window.
Feewhee - Feel the Wheel (Feewhee) is a tool that Microsoft apparently overlooked while making Windows.
Skybn Window On Top - Window on Top can be used to make any application topmost,that is to keep it above all other windows.