in reply to (shared) memory and preloading modules using Mod-perl
He, it also is a versioning thing... When using the latest version of mod-perl, you can use:
# removes a stash (.so, %INC{$stash}, etc.) as best as it can
ModPerl::Util::unload_package($stash);
This is not available in <= versions 1.99 (it's included in mod_perl-2.0.0-RC2-XMas), so mind the version of mod-perl on your servers when using it.