I decided to put together a One Page Dungeon for the One Page Dungeon contest at Campaign Wiki.
You can check out a system neutral version here: Pickett Castle Sys Neutral.
I’ve also got a B/X version of it that I’ll post soon. The only difference is I’ve included monster stats, but i guess if you’re playing seriously enough to need monster stats, maybe you’re missing the point of this module. 🙂
Update: B/X version Pickett Castle W/Stats