Other
The Harry Potter Lexicon
An amazing collection of information, background, and minutiae having to do with the Harry Potter series, including maps and a timeline. There's also an essay section.
Varsity Tutors
Varsity Tutors: Web English Teacher: J. K. Rowling
This teacher guide for J. K. Rowling and her Harry Potter books includes links to a biographical information, lesson plans, and activities.
Curated OER
Goblet of Fire Movie Poster
An engaging site with quizzes, crosswords, news stories, and more about the fictional character Harry Potter.