http://prepan.org/ was recently launched at http://yapcasia.org/2011/ and was announced to the rest of the Perl community by @kentaro.
The site focuses on code review and discussions, with the goal of helping module authors get feedback, suggestions and help before they upload a new module to CPAN.
This is a really interesting idea and is getting lots of use even after having been live for only a couple of days. There are several changes and additions planned for the future, so this is definitely a site to keep an eye on.