Don't know how I missed the significance of this all those years ago, but the CD version of Infogrames' very wonderful Shadow of the Comet features a standalone virtual Lovecraft museum. It's huge, with lots to read and look at, and it serves no other purpose than to educate players about Lovecraft -- all in early-90s pixel art. Genius.
Chaosium still holds the rights, but it doesn't appear to be on sale anywhere. Drop them a line and ask.