Another resource from an excellent blog - Dungeon Fantastic: Megadungeon Design
jheinl
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Found another source - just give credit where credit is due, as per the first post in the thread: The Vault: Rare and unusal stuff for the taking | Adventure Design and Reviews (tenfootpole.org)
Same goes for the Knights and Knaves Alehouse - a dedicated Megadungeon forum. Megadungeons! - Knights & Knaves Alehouse (knights-n-knaves.com)
The Dragonsfoot forums have lots of discussion, which may see a resurgence with #Dungeon23. Megadungeons - Dragonsfoot
I had done something similar the other day, and I see some overlap, but yours if far better organized. Loot links as you see fit. Thalian Musings: Gathering Resources for #Dungeon23