There is a mod_perl deb package in the standard (stable and unstable) distribution, lib_mod_perl, I believe. I've been using that with all other standard perl/apache/dbi driver packages in unstable without problems. (Typically, lib_mod_perl will be updated a day or so after a new upstream apache, and there's a dependancy problem in the lib_mod_perl package that allows apache to be updated without updating lib_mod_perl, so I sometimes have problems with that).

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain
It's not what you know, but knowing how to find it if you don't know that's important