Dungeon Magazine attempted a mega-dungeon with Maure Castle.
What worked in it was a great back story and plot to connect the
levels. What did not was it was never completed.
A Pathfinder AP would have the space to do a new mega-dungeon right.
The plan outlined by James in this thread sounds great. The only
thing I would add is for Paizo and Necromancer to work together on
a Pathfinder Tome of Horrors. Ideally this would be a single
volume with the best of the four Tomes.
Allow paladins with chaotic and neutral good alignments. The class as it has always been written has powers to fight evil yet none to fight chaos. I always believed it worked best as a champion against evil who can follow any good religion.
It would be great if you could combine shipping with pathfinder.
I don't need twelve adventures a year so won't be subscribing to the gamemastery modules but would buy a few if I could get a break on shipping on my orders.