Helium - Helium lets you accept payments by credit card for anything you want to sell online.
Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
PiPer - A DIY Minecraft computer to build gadgets
WindowTop - Easly set any window on top, just move the mouse to the top area of the window.
Pennywise - Cross-platform application to open any website or media in a floating window
Stay On Top - Set a window to stay on top with this single-function but handy application.