This blog is dead!
The campaign fizzled.
4e is just not compatible with proper dungeon crawling. Hard fact.
Combat takes too long for the amount of resources it ultimately expends, which means you don't get enough exploration done, which is the name of the game in megadungeon or at least prettybigdungeon play. For instance, even getting inside the dungeon was a huge deal because any encounter means that about 1/4 to 1/3 of our session is now gone.
Now, that's fine in other styles of play, but not for this one.
Other than that, the campaign was a blast. I think there are lots of good ideas on this blog; so I'll be leaving it up for future reference (my own and maybe yours).