Intel is accepting applications to join the beta program for the Intel C++ and Fortran Compiler Professional Edition 11.1 One can apply by sending email to email@example.com. They ask that you include your name, email address company and reason for your request.
This compiler emits the Intel AVX instructions.
You can try out the executables containing these new instructions using the Intel Software Development Emulator (SDE) http://www.intel.com/software/sde
(There was a bug in the email link for the beta on the SDE web page; those links have now been fixed)