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.
RBTray - Allows almost any program to be minimized to the system tray by right clicking its minimize button.
PiPer - A DIY Minecraft computer to build gadgets
DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.
Pennywise - Cross-platform application to open any website or media in a floating window