Sirena
Sirena's Page
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tweenbots (featured in MAKE) http://www.tweenbots.com/
I like this project because it converts a simple robot into a social project. While I'd like to do something more complex, I think this is an interesting idea to build off of. It'd be interesting to have a robot with sensors so that it does not have navigational issues, and perhaps a built-in wireless camera for public surveillance to see how people interact with the robot. (or perhaps no camera at all) I think it'd be interesting to make it interactive with sensors also, so that it can respond to the public or setting. For example if the noise level reaches a certain point it will play music, and if someone picks it up it will start flashing lights, etc.
Arduino Robot Tutorial http://letsmakerobots.com/node/2164 (refer to above)
and something interesting... The Beat Dress: http://www.we-make-money-not-art.com/archives/2007/09/remember-my-pos.php