Squeak Etoys is a "media authoring tool"-- software that you can download to your computer
and then use to create your own media. You can write out your project and share it with others.
Etoys runs on any Mac or Windows machine, as well as on the OLPC XO machine.
It is free.
Find out about Etoys.
Text of this guide (for searching): Halo Tools: Collapse Reduces an Object to a Small Button. Click on an Ellipse in Supplies and open its halo of handles.
The collapse handle does not show while things are in a book, a holder, or a playfield. Drop them in the world to reveal the collapse handle. Lift this circle with its black handle, drop it in the world and the collapse handle will show.
Collapsed objects become a button in the top left corner of the world that can be moved to new locations. Click to expand it again. Click to throw it away. Collapsed, it look will look like this.