It's not a bad little app, and makes switching between a dozen open windows easier. I've been told it is like Expose for the Mac, but for PC. The game is simple.
"Finish all 15 levels and win a free license of WinPLOSION V.2, a visual task-switcher and alt-tab replacement, worth $10!"
Note: You will be required to provide an email address at the end so they can send you a serial number.