These nodes contain spoilers! (Even this list itself may contain minor spoilers)
Please /msg me with additions and corrections.
Oh, look: categories!
The Harry Potter Project was originally a metanode, the precursor to categories. Now it's evolving into something along the lines of Wikipedia's Projects. Below is a list of Harry Potter-related nodes and non-nodes, annotated so you can see what needs work. Fill the holes in the Potterverse nodegel.
Gryffindor (Could use improvement)
Essays, Rants, Jokes, and Riff-raff
Thanks to Morgan, Queequeg, Cid Highwind, ratbastid, Rancid_Pickle, urthpaw, and a plethora of others.