I also had the same problem with IFORT and ICC with OMPI-1.33 on Mac OS X v10.6. However, I was successfully able to use 10.6 Server with IFORT 11.1.058 and GCC. 

Warner Yuen
Scientific Computing 
Consulting Engineer
Apple, Inc.
email: wyuen@apple.com
Tel: 408.718.2859

On Sep 8, 2009, at 7:11 AM, users-request@open-mpi.org wrote:

Message: 7
Date: Tue, 8 Sep 2009 07:10:50 -0700
From: Marcus Herrmann <marcus.herrmann@asu.edu>
Subject: Re: [OMPI users] Mac OSX 10.6 (SL) + openMPI 1.3.3 + Intel
Compilers 11.1.058 => Segmentation fault
To: Open MPI Users <users@open-mpi.org>
Message-ID: <52515ACC-6E3E-4BEA-AE91-89B587A7C24F@asu.edu>
Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes

the 11.1.058 compilers are not (yet) compatible with snow leopard. See  
the Intel compiler Forums. The gnu compilers however work.