User Summary:
"An Essential Guide to Dungeon Adventuring" - This volume, published relatively late in the 3.5 edition life cycle has a variety of thought, fluff and rules for running dungeon adventures that are interesting and break outside the mold. Authored by Jason Bulmahn and Rich Burlew (creator of Order of the Stick), it remains an interesting reference even aside use of the rules content.
A sample of the writing and tone is this template introduction: "When a dungeon builder needs a deterrent, the only thing better than a giant pit of acid is a giant pit of acid with a shark in it. Until recently, this dream could not be realized because the shark always died after a short time in the acid."