You might be wondering what is Pearhub? From Pearhub.org - 'Pearhub is a pear channel and a pear package publishing platform. As a user, you can install packages. As a developer, you can publish packages'. You can read Troels Knak-Nielsen's introductory blog post here: http://www.sitepoint.com/blogs/2010/01/08/introducing-pearhub.
You'll need an OpenID, an account on github and know how to use git on your system to get everything packaged up and ready to go. You create your app locally, make a github repository for it and set up a pearhub account to point to it. With all of that set up, it's as easy as doing a channel-discover on the pearhub server and running the "pear install" on the package. The rest is done for you!