Playing Jeopardy-style games is a review method that teachers and students have been using for quite a long time. I remember playing Jeopardy games in the 4th grade 20+ years ago. Over the years the game hasn't changed, yet the means of delivering the game have changed.
Jeopardy Labs is a free service you can use to create your own online Jeopardy game. Jeopardy Labs provides a blank template on which to build your game. You do not need to register in order to build your own game. However, if you want to be able to edit your game at a later point you will want to create a password before you create your game. When completed your game is given its one unique url. Post that url on your blog, wiki, or website and anyone can then play your game.
Applications for Education
Jeopardy Labs provides a good way for teachers to create a review game that students can play independently or in the classroom. You could also have students create games that they share with each other.
Here are some related items that may be of interest to you:
Jeopardy PowerPoint Game Template
Parade of Games in PowerPoint