I found this link today for a set of resources for building and running megadungeons at Beyond the Black Gate.
Beyond the Black Gate: Megadungeon Resources
Catchy tune Mister Spock; Vulcan or not, I hope you banged a few of those hobbits.
UPDATE: 27. February 2015: Rest in Peace Leonard. Thanks for all the memories.
Here is the local campaign area map that I have been working on for my latest sandbox. It uses a scale of 1 hex = 3 miles, and while small compared to other local campaign area maps, It allows me to use a real topographical map to generate the features.
Here is a class I have been working on that could be used with any version of the Original RPG. It is a class the manipulates the fabric of space-time to power it’s magics. It is obviously a work in progress so comments would be appreciated.