suExec is used to change the user under which a CGI script runs. The above notice simply tells you it is enabled. It is commonly seen as part of Apache starting for instance, when I restart apache, I get:
[Thu Jul 07 22:09:41 2011] [notice] caught SIGTERM, shutting down
[Thu Jul 07 22:09:43 2011] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Thu Jul 07 22:09:43 2011] [notice] SSL FIPS mode disabled
[Thu Jul 07 22:09:44 2011] [notice] Digest: generating secret for digest authentication ...
[Thu Jul 07 22:09:44 2011] [notice] Digest: done
[Thu Jul 07 22:09:44 2011] [notice] FastCGI: wrapper mechanism enabled (wrapper: /usr/sbin/suexec)
[Thu Jul 07 22:09:44 2011] [notice] FastCGI: process manager initialized (pid xxxx)
[Thu Jul 07 22:09:44 2011] [notice] SSL FIPS mode disabled
[Thu Jul 07 22:09:44 2011] [notice] Apache/2.2.16 (Unix) mod_fastcgi/2.4.6 DAV/2 PHP/5.3.6 mod_ssl/2.2.16 OpenSSL/1.0.0a-fips SVN/1.6.16 configured -- resuming normal operations