Rat & Kobold Sewer
How's this for an intricate dungeon? And all contained on one page, too!
I've been trying to increase the natural flow of my dungeons, and break away from the grid. While I clearly haven't jumped in with both feet, I'd say this is a pretty solid first step. To my eye, the encounter flows up and to the right, before circling back down and ending at that final room. I'm a little concerned about the top left section getting left unexplored, but it's on the left section to catch those Gygaxian purists.
One of the things I'm especially proud of is the large circular cistern that makes for a vertical crossroads of sorts. Who knows what horrible things can be swimming down in the darkness below...