The best link seems to be from the perl.apache.org site, where they have a detailed page on moving to 2.0, including an option to run 2.0 in 1.0 emulation mode. From the site:

As it will be explained in details later, loading Apache2::compat at the server startup, should make the code running properly under 1.0 work under mod_perl 2.0.

Regarding the SUSE Linux link above, I'm pretty sure mod_perl 2.0 is stable; the 1.9x series was the unstable branch leading up to 2.0 stable, if I recall correctly. It might still be tagged as unstable in SUSE's repository, due to bugs on that platform. I know it's still considered unstable on Win32, if that helps. Best to check whatever OS you're running on, along with upgrading to as recent a version of Perl as is reasonable for your setup.

Does that help any?