Collaborative Bluetooth Slideshow
Some of my students might be working on a project using some form of bluetooth communication. It all started out with a desire to learn about Object Exhange (OBEX) as well as some more of the issues of dealing with bluetooth from the commandline in linux.
My experiments lead to a collaborative slideshow display, where users add images from camera phones using bluetooth. I call it BlueCommon and it is held together by ducttape^Wruby. It is probably possible to crash it, and if it fails to send you something it wants to send you I suspect it might get annoingly persistent.
The Nokia 770 is probably a nice platform to run this, or a modified version on.