Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
GhostWin - GhostWin - Free Download -- Transparent Windows Utility supports Windows 2000, 2003, XP, Vista and 7
PiPer - A DIY Minecraft computer to build gadgets
Feewhee - Feel the Wheel (Feewhee) is a tool that Microsoft apparently overlooked while making Windows.
Pennywise - Cross-platform application to open any website or media in a floating window