With this gadget play a pong clone on the Windows Sidebar. It's (very) difficult, but possible to win according to the author.

This text-to-speech gadget is very funny! Very simple, you just have to type a sentence and press ENTER to hear your computer talk.

You wait the weekend impatiently ? This gadget is made for you. This gadget will display if this is Friday. You can also setting prefered day.

 
This space-invaders gadget doesn’t have any actual function. But it makes a pretty nice decoration on the desktop.