Folks should know what the plugin system is, what it's intended use is, that there are some things it isn't meant to be used for, but also, where to go to ask for help to determine whether something is a good fit for the plugin system
and/or ask for extension points to be added to the plugin system API. I will do some research on my own on this if there is time available and contribute if I end up coming up with anything useful, but please don't let that stop anyone who's actively working on RubyGems from beating me to it.
Assigning to @drbrain for first draft. Please assign back for review/editing.