And now for something from the "possibly pointless but fun" file comes a catapult from Instructables user "mrigsby". They have made a small catapult using parts generated from a 3D printer, and used two servos and a spring to both launch the subject and return the catapult back for another fling. So if you're looking for a reason to get a 3D printer, or an excuse to have fun with the children - this could be a lot of fun:
Visit the project page to make your own - however use fake frogs. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
The package includes a wide variety of parts, sensors and modules including: a servo motor, lights, buttons, switches, sound, sensors, breadboard, wires and more. Furthermore a Freetronics Eleven Arduino-compatible board is included to make this an extensive hobby experimenter, inventor and starter kit. However we don't leave you alone to figure it all out, included is a great project and instruction booklet, plus access to a supporting web page and software examples. In other words - this is everything you need to get started for a fun range of electronics and Arduino related projects!