A tutorial on how to setup a open source non code size limited IDE for the ST discovery board and how to write a simple blinking LED program. Links for downloads are below:
ST Discovery General: (find datasheet and schematic here)
http://www.st.com/web/en/catalog/tools/FM116/SC959/SS1532/PF253215
Reference Manual:
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/DM00031936.pdf
USB Driver: http://www.st.com/web/en/catalog/tools/PF258167
IDE: http://www.coocox.org/Index.html