If you have a multi-touch monitor such as Dell SX2210T, HP L2105tm, Acer T230H, Samsung LD220Z, etc., and your computer is running on Windows 7, you can download and install Microsoft Touch Pack for Windows 7 from Microsoft Download Center for free.
Microsoft Touch Pack for Windows 7 includes 6 applications designed to operate with multi-touch screen. After installation, you'll get:
Microsoft Blackboard, which is an intricate game of physics for you to solve puzzles by creating a fanciful machine on a "blackboard".
Microsoft Garden Pond, which is a game that takes place in a Japanese water gardens. Use your hand to create water ripples in the pond on your screen to guide the origami or to put off fire, without actually wetting your hand.
Microsoft Rebound, which is a game in which you use your fingertips to move Tesla balls with an electrical field between them to try and catapult a metal game ball into your opponent's goal.
Microsoft Surface Globe, which is a program that you can use to explore the earth as a flat 2D map or as an immersive 3D experience, similar to Google Earth.
Microsoft Surface Collage, which is a program that you can use to explore and interact with your photos and arrange them as a desktop background, similar to the one in Dell Touch Zone.
Microsoft Surface Lagoon, which is an interactive 3D screensaver that simulation an underwater world with fishes. You can play around with the water and fishes, without actually wetting your hand.