Oooooo…I knew I’d be likin’ Erik in charge of Dungeon!
Obviously G,D,Q are classics as are the S series
I’d like to recommend
A1,A2,A3,A4 (not the supermod): Not only do these mods have some of the best titles (Slave Pits of the Undercity! How cool is that?), But also have many classic elements like GDQ: A mission that gets more and more dangerous, as more twists and turns are encountered, Taking PC’s into the heart of some very dangerous territory. Lot’s of Roleplaying opportunity, as well as investigation, and combat.
C2: Ghost Tower of Inverness: A great take on Moorcock’s Vanishing Tower. The ecology is a bit skewed, but a great mix of puzzles & combat. The “chessboard” rocks!
X2: Chateau D’Amberville.: A great example of taking existing fiction and transplanting it into a D&D campaign w/out it seeming out of place. Plenty of opportunity for Roleplaying w/ some great NPC’s, puzzle solving and combat, along with some cool demi-plane hopping. Highly underrated
U1 The Sinister Secret of Saltmarsh: Excellent low level plot-line. I mean c’mon, A Haunted House, a Mystery, Smugglers, and a ship named “Sea Ghost”, what’s not to love?
T1: The Village of Homlett: along w/ B2 & B4 this is a mini-campaign w/in a module. Interesting NPC’s, A great home base for PC’s, a nice dungeon to get the party in trouble, and a springboard for an entire campaign, all in so few pages.
B4: The Lost City: Another underrated module. The first “desert” module for D&D (predates the I series). Stumble upon the ruins of a buried city, which still thrives w/ some very weird NPCs. Lots of role-play, some combat, and the expandability to make it an entire campaign.
B2: The Keep on the Borderlands: No explanation needed
B1: In Search of the Unknown: see explanation for B2
C1: Hidden Shrine of Tamoachan: Get out of a very bad place before you die from poison gas. Creates lots of tension and excitement. nuff said.
X3 The Curse of Xanathon: another good mystery, and possibly the first “town/city” adventure for D&D. Makes for some interesting roleplaying/situations when the party’s dwarf is suddenly outlawed.