Jigsaw Planet is a fun application that my colleague Ana Falcao on The Consultants-e team brought to my attantion some time ago. And here is an example of how to recycle work you've done in the class by simply taking a photo of your whiteboard and uploading it to Jigsaw Planet. A jigsaw of whatever image you upload is automatically generated, in this case my whiteboard:

You can then either email the link to your students or embed a widget in your wiki or blog like this:

TheEnvironment

This way when the students have completed the jigsaw, they can click on "Exit" and return automatically to the page where the widget is embedded.  Try it and see, but no comments on my poor board work please!

If you can think of other fun ways of using this tool please feel free to add them here.