Here's a fun game I discovered the other day...http://www.synthesiagame.com/. It's a wonderful visual way to play the piano. It is similar to Guitar Hero - only with a keyboard. I downloaded it and tried it. What fun! There are LOADS of songs to choose from and you can practice at your own tempo, even one hand at a time. You can also use it with an attached keyboard or with your mouse.
Any of your students that love computer games will love this! I plan to show it to my students this week at our group lesson. Give it try! But beware...it may be addicting!