use Perl Log In
use Perl Message System
Head over to your message preferences to set it up.
Update: 10/03 18:29 GMT by P : Oh, another new feature I forgot to mention was that you can use URLs now like http://use.perl.org/~gnat/journal/. Instead of "~user" you can also put "my" for your own page. In place of "journal" you can also put "discussions" to see what discussions the user has created, and "pubkey" to see his public key. And without the "journal/" you go to the user's info page, as before.