While searching for on-demand server-side Java compilers for cellphone, I ran into an interest project at MIT Media Lab by accident.  Simply titled Tiny Projector, Stefan Marti documents his work on building prototypes of his solution to limited display problems inherent in mobile devices.

"The basic idea of TinyProjector is to create the smallest possible character projector that can be either integrated into mobile device, or linked dynamically with wireless RF connections like serial low range transceivers." – Stefan Marti

Stefan provides plenty of diagrams and pictures of circuits, models, and his solderworks.  He looked like he was having hell of a fun time doing it.  Starting from July 2001 to May 2002, his project progressed from this:

To this:

What was the difference?  Cellphone users won't have to twirl their cellphones!  Aside from the coolness of the idea, the paper is a fun look at how technologies get developed at personal level.  I enjoyed reading it.