Hey,
in an attempt to improve the documentation for plugin developers I just added
a new post named "MediaDrop Plugin Basics" which explains the basics of
building a MediaDrop plugin:
http://mediadrop.net/blog/2013/mediadrop-plugin-basics.html
Also there is the "Operators Guide to MediaCore CE Plugins" which tells you
how to install/debug plugins:
http://mediadrop.net/blog/2013/operators-guide-to-mediacore-ce-plugins.html
Of course these posts will be added to the main documentation over time but
that's my first shot. Let me know if something is wrong/unclear in these posts.
Next in this series will be "Adding Tables to the Database and Migrating Data
safely".
fs