As Brett Bieber mentions in this new blog entry, there's been an OS X release of the Chiara_PEAR_Server package (a "droplet").

This is a Mac OS X droplet for PEAR developers that run Chiara_PEAR_Server. This little droplet just takes in your PEAR Package .tgz and it will release it to Chiara_PEAR_Server.

He idea of the droplet is to automate the packaging process for a tgz file to post it out to a PEAR channel server. Sounds quite handy - check it out for yourself by grabbing the source from svn.saltybeagle.com.