The world's first Java EE 5 compatible implementation
TmaxSoft (yes, where I work now) achieved it (of course except the Sun RI :-). See http://java.sun.com/javaee/overview/compatibility.jsp for more details. We are planning to release some preview as well.
Thank you all for your great help, especially Alan, Arthur, and Stephen from the Sun CTS team. I couldn't forget such a beautiful weather in Boston.
P.S. More about this to come, so stay tuned!