Tony Bibbs has posted a handy howto guide on publishing your application via a PEAR channel:

I have produced a HOWTO for both our system administrators and our developers. I've condensed this down to be a bit more generic and useful to anybody looking to establish their own PEAR Channel for the same purpose. My example hereon is that your channel is at pear.example.com.

Come along on the journey of a developer making their very first PEAR package and deploying it to a PEAR channel using a real-word example. Seasoned PHP developers be packaging and deploying PEAR compatible packages in no time.

He walks you through how to install the PEAR package creator, package up your application into a PEAR package, and how to make it available anyone and everyone that wants to give it a shot (including the PEAR commands they'll need to get it).