This is the first beta release of extproc_perl 2.0. Major changes include the addition of a configuration file, easier installation and relink procedures, definition of internal procedures in the "Perl" PL/SQL package, support for non-VARCHAR2 Oracle datatypes, support for "IN OUT" and "OUT" parameters, partitioned code parsing, user-defined destructors, and a major cleanup and optimization of all code. The website has also been updated to include a comprehensive user's guide.
Check it out at http://www.smashing.org/extproc_perl. The examples and user's guide are a good place to start.