Contrary to 1.3 and to the suexec docs: http://httpd.apache.org/docs-2.0/suexec.html#enable there is no easy way to find out if suexec is enabled. There is no message written to the error log, and no mention of suexec in httpd -l or -v or -V (other than the path to the suexec binary). This makes it much harder to debug cgi problems.
Uhm, there's a message written into the error log, but unfortunately it may be wrong. After an accompanying APR patch (to determine the setuid bit) this is fixed in 2.1 now.
Fixed in latest APR/httpd.