The freescale S08JS series is one of the lowest cost microcontrollers with a hardware USB implementation. The availability of free C development tools (SDCC and Codewarrior) make the S08JS a great candidate to develop all sorts of inexpensive USB gadgets. microJS is a fully functional S08JS minimal system on a PCB less than a square inch. The board headers can be plugged into a breadboard for prototyping or soldered to another PCB for a permanent placement.
After more than a year of development and 2 release candidates, the SDCC team has released the new 3.0.0 version of this great multi platform cross compiler for MCUs. This version supports: 8051, DS390, Z80, HC08, and PIC MCUs.
Besides the numerous bug fixes here is a list of the important changes since the release 2.9.0 (list taken from SDCC website):