Good call, chipmunk. I presume you could use carpout() from CGI::Carp to redirect warn/carp/cluck calls to STDOUT.

Additionally as of CGI::Carp v1.20:

use CGI::Carp qw(fatalsToBrowser warningsToBrowser);
[download]

With this, you can call

warningsToBrowser(1)

to past warnings to the browser after the call.

Being proven wrong is one of the best reasons to go RTFM, I guess. =]

-marius