I know Jean Labrosse personally. μC/OS is a nice RTOS if you have the right kind of application. They now have a company called Micrium that sells the updated version of μC/OS.
There are several evaluation platforms that are available really cheap like this one:
http://www.st.com/internet/evalboard/product/247091.jsp . μC/OS works quite well with the Cortex M0/M3/M4 series processors as well as with the Renasas processors. Very reliable and dependable with great latency numbers.
Good luck,
Mike