I posted a page that briefly explains how to compile, link and run the demonstration code for the STM32F3Discovery board (Cortex M4) using CrossWorks from Rowley. ST had projects for several platform except CrossWorks, now this is fixed.
I didn't describe the steps required to get the code to actually compile and link but provided a solution and a project that allows you to do just that. Files are available at the bottom of this page: https://sites.google.
The project is also configured to use the ST-Link built-in programmer that comes with the board.
I can update the page if more details happen to be required.