The hits keep on coming: G1: Steading of the Hill Giant Chief is also a classic. I know most parties first encountered this merry bit of mayhem as part of the G1-2-3 Against the Giants green cover that has a panel-van-waiting-to-happen picture. But I once or twice saw people, actual people, with the well-sort-of original G1 in all its monochrome glory.
In addition to Chief Nosrna and his chums, which include a cloud giant and 22 other hill giants, there also are four insane manticores, two carrion crawlers, two intelligent swords, and, best of all, a weird abandoned temple. There is a lot to like about this place: “faintly glowing purple green stone” that has disturbing images carved into it; a greasy feeling altar; a place in the back of the cavern that has a 50% chance of making a lookie-loo thief insane but then starts to give out scarabs and 5,000 g.p. gems.
Also: two Perverse Osmosis songs are influenced by this module.