Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
GridMove - GridMove - A window management tool that can quickly arrange your windows into desktop grids.
GhostWin - GhostWin - Free Download -- Transparent Windows Utility supports Windows 2000, 2003, XP, Vista and 7
Preme for Windows - Speeds up your window switching.
Feewhee - Feel the Wheel (Feewhee) is a tool that Microsoft apparently overlooked while making Windows.