A slightly more recent (2012) project:
A Chinese-English dictionary for the Nokia N9

Some useless things I made a long time ago:
A minimalistic, dynamically typed, imperative language with lexical scope, nested, higher order functions and a prototype-based object model.
An OS for the Gameboy Advance.  Includes a port of the Waba VM.
A weather report downloading program for Symbian Series 60 phones.